{"id":32461,"date":"2024-11-25T14:43:21","date_gmt":"2024-11-25T06:43:21","guid":{"rendered":"https:\/\/fwq.ai\/blog\/32461\/"},"modified":"2024-11-25T14:43:21","modified_gmt":"2024-11-25T06:43:21","slug":"%e4%bb%80%e4%b9%88%e6%98%af%e6%87%92%e5%8a%a0%e8%bd%bd%ef%bc%9f%e5%b0%8f%e7%a8%8b%e5%ba%8f%e4%b8%ad%e5%9b%be%e7%89%87%e6%87%92%e5%8a%a0%e8%bd%bd%e7%9a%84%e4%b8%a4%e7%a7%8d%e5%ae%9e%e7%8e%b0%e6%96%b9","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/32461\/","title":{"rendered":"\u4ec0\u4e48\u662f\u61d2\u52a0\u8f7d\uff1f\u5c0f\u7a0b\u5e8f\u4e2d\u56fe\u7247\u61d2\u52a0\u8f7d\u7684\u4e24\u79cd\u5b9e\u73b0\u65b9\u6cd5"},"content":{"rendered":"

\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5e26\u6765\u7684\u5185\u5bb9\u662f\u5173\u4e8e\u4ec0\u4e48\u662f\u61d2\u52a0\u8f7d\uff1f\u5c0f\u7a0b\u5e8f\u4e2d\u56fe\u7247\u61d2\u52a0\u8f7d\u7684\u4e24\u79cd\u5b9e\u73b0\u65b9\u6cd5 \uff0c\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u6709\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n

\u5b9a\u4e49<\/h2>\n

\u61d2\u52a0\u8f7d\uff0c\u524d\u7aef\u4eba\u90fd\u77e5\u9053\u7684\u4e00\u79cd\u6027\u80fd\u4f18\u5316\u65b9\u5f0f\uff0c\u7b80\u5355\u7684\u6765\u8bf4\uff0c\u53ea\u6709\u5f53\u56fe\u7247\u51fa\u73b0\u5728\u6d4f\u89c8\u5668\u7684\u53ef\u89c6\u533a\u57df\u5185\u65f6\uff0c\u624d\u8bbe\u7f6e\u56fe\u7247\u6b63\u771f\u7684\u8def\u5f84\uff0c\u8ba9\u56fe\u7247\u663e\u793a\u51fa\u6765\u3002\u8fd9\u5c31\u662f\u56fe\u7247\u61d2\u52a0\u8f7d\u3002<\/p>\n

\u5b9e\u73b0\u539f\u7406<\/h2>\n

\u76d1\u542c\u9875\u9762\u7684scroll\u4e8b\u4ef6,\u5224\u8bfb\u5143\u7d20\u8ddd\u79bb\u9875\u9762\u7684top\u503c\u662f\u5426\u662f\u5c0f\u4e8e\u7b49\u4e8e\u9875\u9762\u7684\u53ef\u89c6\u9ad8\u5ea6<\/p>\n

\u5224\u65ad\u903b\u8f91\u4ee3\u7801\u5982\u4e0b<\/p>\n

element.getBoundingClientRect().top <\/p>\n

\u6211\u4eec\u77e5\u9053\u5c0f\u7a0b\u5e8f\u9875\u9762\u7684\u811a\u672c\u903b\u8f91\u662f\u5728JsCore\u4e2d\u8fd0\u884c\uff0cJsCore\u662f\u4e00\u4e2a\u6ca1\u6709\u7a97\u53e3\u5bf9\u8c61\u7684\u73af\u5883\uff0c\u6240\u4ee5\u4e0d\u80fd\u5728\u811a\u672c\u4e2d\u4f7f\u7528window\uff0c\u4e5f\u65e0\u6cd5\u5728\u811a\u672c\u4e2d\u64cd\u4f5c\u7ec4\u4ef6\u3002<\/p>\n

\u6240\u4ee5\u5173\u4e8e\u56fe\u7247\u61d2\u52a0\u8f7d\u5c31\u9700\u8981\u5728\u6570\u636e\u4e0a\u9762\u505a\u6587\u7ae0\u4e86\u3002<\/p>\n

\u9875\u9762<\/h2>\n

\u9875\u9762\u4e0a\u9762\u53ea\u9700\u8981\u6839\u636e\u6570\u636e\u7684\u67d0\u4e00\u4e2a\u5b57\u6bb5\u6765\u5224\u65ad\u662f\u5426\u663e\u793a\u56fe\u7247\u5c31\u53ef\u4ee5\u4e86\uff0c\u5b57\u6bb5\u4e3aBoolean\u7c7b\u578b\uff0c\u5f53\u4e3afalse\u7684\u65f6\u5019\u663e\u793a\u9ed8\u8ba4\u56fe\u7247\u5c31\u884c\u4e86\u3002<\/p>\n

\u4ee3\u7801\u5927\u6982\u957f\u6210\u8fd9\u6837<\/p>\n

<view wx:for=\"{{list}}\" class='item item-{{index}}'\n wx:key=\"{{index}}\">\n    <image class=\"{{item.show ? 'active': ''}}\" src=\"{{item.show ? item.src : item.def}}\"><\/image>\n<\/view><\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5e03\u5c40\u8ddf\u7b80\u5355\uff0cview\u7ec4\u4ef6\u91cc\u9762\u6709\u4e2a\u56fe\u7247\uff0c\u5e76\u5faa\u73aflist\uff0c\u6709\u591a\u5c11\u5c31\u5c55\u793a\u591a\u5c11<\/p>\n
image\u7ec4\u4ef6\u7684src\u5b57\u6bb5\u901a\u8fc7\u6bcf\u4e00\u9879\u7684show\u6765\u8fdb\u884c\u7ed1\u5b9a\uff0cactive\u662f\u52a0\u4e86\u4e2a\u900f\u660e\u7684\u8fc7\u6e21<\/p>\n
\u6837\u5f0f<\/h2>\n
image{\n    transition: all .3s ease;\n    opacity: 0;\n}\n.active{\n    opacity: 1;\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u903b\u8f91<\/h2>\n
\u672c\u4f4d\u4e3b\u8981\u8bb2\u89e3\u61d2\u52a0\u8f7d\uff0c\u6240\u4ee5\u628a\u6570\u636e\u5199\u6b7b\u5728\u9875\u9762\u4e0a\u4e86<\/p>\n
\u6570\u636e\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n
\"\u4ec0\u4e48\u662f\u61d2\u52a0\u8f7d\uff1f\u5c0f\u7a0b\u5e8f\u4e2d\u56fe\u7247\u61d2\u52a0\u8f7d\u7684\u4e24\u79cd\u5b9e\u73b0\u65b9\u6cd5\u63d2\u56fe\"<\/span><\/p>\n
\u6211\u4eec\u4f7f\u7528\u4e24\u79cd\u65b9\u5f0f\u6765\u5b9e\u73b0\u61d2\u52a0\u8f7d\uff0c\u51c6\u5907\u597d\u6ca1\u6709\uff0c\u4e00\u8d77\u6765\u5feb\u4e50\u7684\u64b8\u7801\u5427\u3002<\/p>\n
WXML\u8282\u70b9\u4fe1\u606f<\/h3>\n
\u5c0f\u7a0b\u5e8f\u652f\u6301\u8c03\u7528createSelectQuery\u521b\u5efa\u4e00\u4e2aSelectorQuery\u5b9e\u4f8b\uff0c\u5e76\u4f7f\u7528select\u65b9\u6cd5\u6765\u9009\u62e9\u8282\u70b9\uff0c\u5e76\u901a\u8fc7boundingClientRect\u6765\u83b7\u53d6\u8282\u70b9\u4fe1\u606f\u3002<\/p>\n
wx.createSelectorQuery().select('.item').boundingClientRect((ret)=>{\n    console.log(ret)\n}).exec()<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u663e\u793a\u7ed3\u679c\u5982\u4e0b<\/p>\n
\"\u4ec0\u4e48\u662f\u61d2\u52a0\u8f7d\uff1f\u5c0f\u7a0b\u5e8f\u4e2d\u56fe\u7247\u61d2\u52a0\u8f7d\u7684\u4e24\u79cd\u5b9e\u73b0\u65b9\u6cd5\u63d2\u56fe1\"<\/span>\u6084\u6084\u544a\u8bc9\u4f60\uff0c\u5c0f\u7a0b\u5e8f\u91cc\u9762\u6709\u4e2aonPageScroll\u51fd\u6570\uff0c\u662f\u7528\u6765\u76d1\u542c\u9875\u9762\u7684\u6eda\u52a8\u7684\u3002
\u8fd8\u6709\u4e2agetSystemInfo\u51fd\u6570\uff0c\u53ef\u4ee5\u83b7\u53d6\u83b7\u53d6\u7cfb\u7edf\u4fe1\u606f\uff0c\u91cc\u9762\u5305\u542b\u5c4f\u5e55\u7684\u9ad8\u5ea6\u3002<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u601d\u8def\u5c31\u900f\u5f7b\u4e86\u5427\u3002\u8fd8\u662f\u4e0a\u9762\u7684\u903b\u8f91\uff0c \u6252\u62c9\u6252\u62c9\u76f4\u63a5\u5199\u4ee3\u7801\u5c31\u884c\u4e86,\u8fd9\u91cc\u53ea\u5199\u4e0b\u4e3b\u8981\u7684\u903b\u8f91<\/p>\n
showImg(){\n    let group = this.data.group\n    let height = this.data.height  \/\/ \u9875\u9762\u7684\u53ef\u89c6\u9ad8\u5ea6\n    \n    wx.createSelectorQuery().selectAll('.item').boundingClientRect((ret) => {\n     ret.forEach((item, index) => {\n       if (item.top <= height) { \u5224\u65ad\u662f\u5426\u5728\u663e\u793a\u8303\u56f4\u5185\n         group[index].show = true \/\/ \u6839\u636e\u4e0b\u6807\u6539\u53d8\u72b6\u6001\n       }\n     })\n     this.setData({\n       group\n     })\n    }).exec()\n\n}\nonPageScroll(){ \/\/ \u6eda\u52a8\u4e8b\u4ef6\n    this.showImg()\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u81f3\u6b64\uff0c\u6211\u4eec\u5b8c\u6210\u4e86\u4e00\u4e2a\u5c0f\u7a0b\u5e8f\u7248\u7684\u56fe\u7247\u61d2\u52a0\u8f7d\uff0c\u53ea\u662f\u601d\u7ef4\u8f6c\u53d8\u4e86\u4e0b\uff0c\u5176\u5b9e\u5e76\u6ca1\u6709\u6539\u53d8\u5b9e\u73b0\u65b9\u5f0f\u3002\u6211\u4eec\u6765\u5b66\u4e9b\u65b0\u7684\u4e1c\u897f\u5427\u3002<\/p>\n
\u8282\u70b9\u5e03\u5c40\u76f8\u4ea4\u72b6\u6001<\/h3>\n
\u8282\u70b9\u76f8\u4ea4\u72b6\u6001\u662f\u5565\uff1f\u5b83\u662f\u4e00\u4e2a\u65b0\u7684API\uff0c\u53eb\u505aIntersectionObserver, \u672c\u6587\u53ea\u8bb2\u89e3\u7b80\u5355\u7684\u4f7f\u7528\uff0c\u4e86\u89e3\u66f4\u591a\u8bf7\u731b\u6233\u6ca1\u9519\uff0c\u5c31\u662f\u70b9\u6211<\/p>\n
\u5c0f\u7a0b\u5e8f\u91cc\u9762\u7ed9\u5b83\u7684\u5b9a\u4e49\u662f\u8282\u70b9\u5e03\u5c40\u4ea4\u53c9\u72b6\u6001API\u53ef\u7528\u4e8e\u76d1\u542c\u4e24\u4e2a\u6216\u591a\u4e2a\u7ec4\u4ef6\u8282\u70b9\u5728\u5e03\u5c40\u4f4d\u7f6e\u4e0a\u7684\u76f8\u4ea4\u72b6\u6001\u3002\u8fd9\u4e00\u7ec4API\u5e38\u5e38\u53ef\u4ee5\u7528\u4e8e\u63a8\u65ad\u67d0\u4e9b\u8282\u70b9\u662f\u5426\u53ef\u4ee5\u88ab\u7528\u6237\u770b\u89c1\u3001\u6709\u591a\u5927\u6bd4\u4f8b\u53ef\u4ee5\u88ab\u7528\u6237\u770b\u89c1\u3002<\/p>\n
\u91cc\u9762\u8bbe\u8ba1\u7684\u6982\u5ff5\u4e3b\u8981\u6709\u4e94\u4e2a\uff0c\u5206\u522b\u4e3a<\/p>\n
\u53c2\u7167\u8282\u70b9\uff1a\u4ee5\u67d0\u53c2\u7167\u8282\u70b9\u7684\u5e03\u5c40\u533a\u57df\u4f5c\u4e3a\u53c2\u7167\u533a\u57df\uff0c\u53c2\u7167\u8282\u70b9\u53ef\u4ee5\u6709\u591a\u4e2a\uff0c\u591a\u4e2a\u8bdd\u53c2\u7167\u533a\u57df\u53d6\u5b83\u4eec\u7684\u5e03\u5c40\u533a\u57df\u7684\u4ea4\u96c6<\/p>\n
\u76ee\u6807\u8282\u70b9\uff1a\u76d1\u542c\u7684\u76ee\u6807\uff0c\u53ea\u80fd\u662f\u4e00\u4e2a\u8282\u70b9<\/p>\n
\u76f8\u4ea4\u533a\u57df\uff1a\u76ee\u6807\u8282\u70b9\u4e0e\u53c2\u7167\u8282\u70b9\u7684\u76f8\u4ea4\u533a\u57df<\/p>\n
\u76f8\u4ea4\u6bd4\u4f8b\uff1a\u76ee\u6807\u8282\u70b9\u4e0e\u53c2\u7167\u8282\u70b9\u7684\u76f8\u4ea4\u6bd4\u4f8b<\/p>\n
\u9608\u503c\uff1a\u53ef\u4ee5\u6709\u591a\u4e2a\uff0c\u9ed8\u8ba4\u4e3a[0], \u53ef\u4ee5\u7406\u89e3\u4e3a\u4ea4\u53c9\u6bd4\u4f8b\uff0c\u4f8b\u5982[0.2, 0.5]<\/p>\n
\u5173\u4e8e\u5b83\u7684API\u6709\u4e94\u4e2a\uff0c\u4f9d\u6b21\u5982\u4e0b<\/p>\n
1\u3001createIntersectionObserver([this], [options])\uff0c\u89c1\u540d\u77e5\u610f,\u521b\u5efa\u4e00\u4e2aIntersectionObserver\u5b9e\u4f8b<\/p>\n
2\u3001intersectionObserver.relativeTo(selector, [margins]), \u6307\u5b9a\u8282\u70b9\u4f5c\u4e3a\u53c2\u7167\u533a\u57df\uff0cmargins\u53c2\u6570\u53ef\u4ee5\u653e\u5927\u7f29\u5c0f\u53c2\u7167\u533a\u57df\uff0c\u53ef\u4ee5\u5305\u542btop\u3001left\u3001bottom\u3001right\u56db\u9879<\/p>\n
3\u3001intersectionObserver.relativeToViewport([margin])\uff0c\u6307\u5b9a\u9875\u9762\u663e\u793a\u533a\u57df\u4e3a\u53c2\u7167\u533a\u57df<\/p>\n
4\u3001intersectionObserver.observer(targetSelector, callback)\uff0c\u53c2\u6570\u4e3a\u6307\u5b9a\u76d1\u542c\u7684\u8282\u70b9\u548c\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u76ee\u6807\u5143\u7d20\u7684\u76f8\u4ea4\u72b6\u6001\u53d1\u751f\u53d8\u5316\u65f6\u5c31\u4f1a\u89e6\u53d1\u6b64\u51fd\u6570\uff0ccallback\u51fd\u6570\u5305\u542b\u4e00\u4e2aresult\uff0c\u4e0b\u9762\u518d\u8bb2<\/p>\n
5\u3001intersectionObserver.disconnect() \u505c\u6b62\u76d1\u542c\uff0c\u56de\u8c03\u51fd\u6570\u4e0d\u4f1a\u518d\u89e6\u53d1<\/p>\n
\u7136\u540e\u8bf4\u4e0bcallback\u51fd\u6570\u4e2d\u7684result\uff0c\u5b83\u5305\u542b\u7684\u5b57\u6bb5\u4e3a<\/p>\n\n\n\n\n\n\n\n\n\n
\u5b57\u6bb5\u540d<\/th>\n\u7c7b\u578b<\/th>\n\u8bf4\u660e<\/th>\n<\/tr>\n<\/thead>\n
intersectionRatio<\/td>\nNumber<\/td>\n\u76f8\u4ea4\u6bd4\u4f8b<\/td>\n<\/tr>\n
intersectionRect<\/td>\nObject<\/td>\n\u76f8\u4ea4\u533a\u57df\u7684\u8fb9\u754c\uff0c\u5305\u542b left \u3001 right \u3001 top \u3001 bottom \u56db\u9879<\/td>\n<\/tr>\n
boundingClientRect<\/td>\nObject<\/td>\n\u76ee\u6807\u8282\u70b9\u5e03\u5c40\u533a\u57df\u7684\u8fb9\u754c\uff0c\u5305\u542b left \u3001 right \u3001 top \u3001 bottom \u56db\u9879<\/td>\n<\/tr>\n
relativeRect<\/td>\nObject<\/td>\n\u53c2\u7167\u533a\u57df\u7684\u8fb9\u754c\uff0c\u5305\u542b left \u3001 right \u3001 top \u3001 bottom \u56db\u9879<\/td>\n<\/tr>\n
time<\/td>\nNumber<\/td>\n\u76f8\u4ea4\u68c0\u6d4b\u65f6\u7684\u65f6\u95f4\u6233<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u6211\u4eec\u4e3b\u8981\u4f7f\u7528intersectionRatio\u8fdb\u884c\u5224\u65ad\uff0c\u5f53\u5b83\u5927\u4e8e0\u65f6\u8bf4\u660e\u662f\u76f8\u4ea4\u7684\u4e5f\u5c31\u662f\u53ef\u89c1\u7684\u3002<\/p>\n
\u5148\u6765\u6ce2\u6d4b\u8bd5\u9898\uff0c\u8bf7\u8bf4\u51fa\u4e0b\u9762\u7684\u51fd\u6570\u505a\u4e86\u4ec0\u4e48\uff0c\u5e76\u4e14log\u51fd\u6570\u4f1a\u6267\u884c\u51e0\u6b21<\/p>\n
1\u3001\nwx.createIntersectionObserver().relativeToViewport().observer('.box', (result) => {\n     console.log('\u76d1\u542cbox\u7ec4\u4ef6\u89e6\u53d1\u7684\u51fd\u6570')   \n })\n \n2\u3001\nwx.createIntersectionObserver().relativeTo('.box').observer('.item', (result) => {\n     console.log('\u76d1\u542citem\u7ec4\u4ef6\u89e6\u53d1\u7684\u51fd\u6570') \n})\n\n3\u3001\nwx.createIntersectionObserver().relativeToViewport().observer('.box', (result) => {\n    if(result.intersectionRatio > 0){\n        console.log('.box\u7ec4\u4ef6\u662f\u53ef\u89c1\u7684') \n    }\n})<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
duang\uff0c\u63ed\u6653\u7b54\u6848\u3002<\/p>\n
\u7b2c\u4e00\u4e2a\u4ee5\u5f53\u524d\u9875\u9762\u7684\u89c6\u7a97\u76d1\u542c\u4e86.box\u7ec4\u4ef6\uff0clog\u4f1a\u89e6\u53d1\u4e24\u6b21\uff0c\u4e00\u6b21\u662f\u8fdb\u5165\u9875\u9762\u4e00\u6b21\u662f\u79bb\u5f00\u9875\u9762<\/p>\n
\u7b2c\u4e8c\u4e2a\u4ee5.box\u8282\u70b9\u7684\u5e03\u5c40\u533a\u57df\u76d1\u542c\u4e86.item\u7ec4\u4ef6\uff0clog\u4f1a\u89e6\u53d1\u4e24\u6b21\uff0c\u4e00\u6b21\u662f\u8fdb\u5165\u9875\u9762\u4e00\u6b21\u662f\u79bb\u5f00\u9875\u9762<\/p>\n
\u7b2c\u4e09\u4e2a\u4ee5\u5f53\u524d\u9875\u9762\u7684\u89c6\u7a97\u76d1\u542c\u4e86.box\u7ec4\u4ef6\uff0clog\u53ea\u4f1a\u5728\u8282\u70b9\u53ef\u89c1\u7684\u65f6\u5019\u89e6\u53d1<\/p>\n
\u597d\u4e86\uff0c\u9898\u4e5f\u505a\u4e86\uff0cAPI\u4f60\u4e5f\u638c\u63e1\u4e86\uff0c\u76f8\u4fe1\u4f60\u5df2\u7ecf\u53ef\u4ee5\u4f7f\u7528IntersectionObserver\u6765\u5b9e\u73b0\u56fe\u7247\u61d2\u52a0\u8f7d\u4e86\u5427\uff0c\u4e3b\u8981\u903b\u8f91\u5982\u4e0b<\/p>\n
let group = this.data.group \/\/ \u83b7\u53d6\u56fe\u7247\u6570\u7ec4\u6570\u636e\nfor (let i in this.data.group){   wx.createIntersectionObserver().relativeToViewport().observe('.item-'+ i, (ret) => {\n       if (ret.intersectionRatio > 0){\n         group[i].show = true \n       }\n       this.setData({\n         group\n       })\n     })\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6700\u540e<\/h2>\n
\u81f3\u6b64\uff0c\u6211\u4eec\u4f7f\u7528\u4e24\u79cd\u65b9\u5f0f\u5b9e\u73b0\u4e86\u5c0f\u7a0b\u5e8f\u7248\u672c\u7684\u56fe\u7247\u61d2\u52a0\u8f7d\uff0c\u53ef\u4ee5\u53d1\u73b0\uff0c\u4f7f\u7528IntersectionObserver\u6765\u5b9e\u73b0\u4e0d\u8981\u592a\u9178\u723d\u3002<\/p>\n
\u76f8\u5173\u63a8\u8350\uff1a<\/p>\n
<\/p>\n<\/p>\n
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