{"id":29536,"date":"2024-11-25T09:37:51","date_gmt":"2024-11-25T01:37:51","guid":{"rendered":"https:\/\/fwq.ai\/blog\/29536\/"},"modified":"2024-11-25T09:37:51","modified_gmt":"2024-11-25T01:37:51","slug":"%e5%be%ae%e4%bf%a1%e5%b0%8f%e7%a8%8b%e5%ba%8f%e5%bc%80%e5%8f%91%e5%88%97%e8%a1%a8%e4%b8%8a%e6%8b%89%e5%8a%a0%e8%bd%bd%e4%b8%8b%e6%8b%89%e5%88%b7%e6%96%b0%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a0%81","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/29536\/","title":{"rendered":"\u5fae\u4fe1\u5c0f\u7a0b\u5e8f\u5f00\u53d1\u5217\u8868\u4e0a\u62c9\u52a0\u8f7d\u4e0b\u62c9\u5237\u65b0\u793a\u4f8b\u4ee3\u7801"},"content":{"rendered":"

\u672c\u7bc7\u6587\u7ae0\u4e3b\u8981\u4ecb\u7ecd\u4e86\u5fae\u4fe1\u5c0f\u7a0b\u5e8f\u5217\u8868\u4e0a\u62c9\u52a0\u8f7d\u4e0b\u62c9\u5237\u65b0\u793a\u4f8b\uff0c\u975e\u5e38\u5177\u6709\u5b9e\u7528\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e0b\u3002<\/p>\n

1.\u5217\u8868\uff08\u672c\u90e8\u5206\u5185\u5bb9\u51fa\u5165\u5b98\u65b9\u6587\u6863\uff09<\/strong><\/p>\n

\u5bf9\u4e8e\u8fd9\u4e2a\u529f\u80fd\uff0c\u5fae\u4fe1\u5c0f\u7a0b\u5e8f\u4e2d\u5e76\u6ca1\u6709\u63d0\u4f9b\u7c7b\u4f3c\u4e8eAndroid\u4e2dlistview\u6027\u8d28\u7684\u63a7\u4ef6\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u4f7f\u7528 wx:for \u63a7\u5236\u5c5e\u6027\u7ed1\u5b9a\u4e00\u4e2a\u6570\u7ec4\uff0c\u7528\u6570\u7ec4\u4e2d\u5404\u9879\u7684\u6570\u636e\u91cd\u590d\u6e32\u67d3\u8be5\u7ec4\u4ef6\uff0c\u6765\u8fbe\u5230\u5217\u8868\u7684\u6548\u679c\u3002<\/p>\n

<\/p>\n

<view>\r\n {{index}}: {{item.message}}\r\n<\/view><\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
<\/p>\n
Page({\r\n data: {\r\n array: [{\r\n  message: 'foo',\r\n }, {\r\n  message: 'bar'\r\n }]\r\n }\r\n})<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u9ed8\u8ba4\u6570\u7ec4\u7684\u5f53\u524d\u9879\u7684\u4e0b\u6807\u53d8\u91cf\u540d\u9ed8\u8ba4\u4e3aindex\uff0c\u6570\u7ec4\u5f53\u524d\u9879\u7684\u53d8\u91cf\u540d\u9ed8\u8ba4\u4e3aitem\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5\u901a\u8fc7 wx:for-item \u548c wx:for-index \u6307\u5b9a\u3002<\/p>\n
<\/p>\n
<view>\r\n {{idx}}: {{itemName.message}}\r\n<\/view><\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
wx:for\u4e5f\u53ef\u4ee5\u5d4c\u5957\uff0c\u4e0b\u8fb9\u662f\u4e00\u4e2a\u4e5d\u4e5d\u4e58\u6cd5\u8868<\/p>\n
<\/p>\n
<view>\r\n <view>\r\n <view>\r\n  {{i}} * {{j}} = {{i * j}}\r\n <\/view>\r\n <\/view><\/view><\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
block wx:for <\/p>\n
\u7c7b\u4f3cblock wx:if\uff0c\u4e5f\u53ef\u4ee5\u5c06wx:for\u7528\u5728 \u6807\u7b7e\u4e0a\uff0c\u4ee5\u6e32\u67d3\u4e00\u4e2a\u5305\u542b\u591a\u8282\u70b9\u7684\u7ed3\u6784\u5757\u3002\u4f8b\u5982\uff1a<\/p>\n
<\/p>\n
<block>\r\n <view> {{index}}: <\/view>\r\n <view> {{item}} <\/view><\/block><\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
wx:key<\/p>\n
\u5982\u679c\u5217\u8868\u4e2d\u9879\u76ee\u7684\u4f4d\u7f6e\u4f1a\u52a8\u6001\u6539\u53d8\u6216\u8005\u6709\u65b0\u7684\u9879\u76ee\u6dfb\u52a0\u5230\u5217\u8868\u4e2d\uff0c\u5e76\u4e14\u5e0c\u671b\u5217\u8868\u4e2d\u7684\u9879\u76ee\u4fdd\u6301\u81ea\u5df1\u7684\u7279\u5f81\u548c\u72b6\u6001\uff08\u5982  \u4e2d\u7684\u8f93\u5165\u5185\u5bb9\uff0c  \u7684\u9009\u4e2d\u72b6\u6001\uff09\uff0c\u9700\u8981\u4f7f\u7528 wx:key \u6765\u6307\u5b9a\u5217\u8868\u4e2d\u9879\u76ee\u7684\u552f\u4e00\u7684\u6807\u8bc6\u7b26\u3002<\/p>\n
wx:key \u7684\u503c\u4ee5\u4e24\u79cd\u5f62\u5f0f\u63d0\u4f9b<\/p>\n
1. \u5b57\u7b26\u4e32\uff0c\u4ee3\u8868\u5728 for \u5faa\u73af\u7684 array \u4e2d item \u7684\u67d0\u4e2a property\uff0c\u8be5 property \u7684\u503c\u9700\u8981\u662f\u5217\u8868\u4e2d\u552f\u4e00\u7684\u5b57\u7b26\u4e32\u6216\u6570\u5b57\uff0c\u4e14\u4e0d\u80fd\u52a8\u6001\u6539\u53d8\u3002 <\/p>\n
2. \u4fdd\u7559\u5173\u952e\u5b57 *this \u4ee3\u8868\u5728 for \u5faa\u73af\u4e2d\u7684 item \u672c\u8eab\uff0c\u8fd9\u79cd\u8868\u793a\u9700\u8981 item \u672c\u8eab\u662f\u4e00\u4e2a\u552f\u4e00\u7684\u5b57\u7b26\u4e32\u6216\u8005\u6570\u5b57\uff0c\u5982\uff1a 
\u5f53\u6570\u636e\u6539\u53d8\u89e6\u53d1\u6e32\u67d3\u5c42\u91cd\u65b0\u6e32\u67d3\u7684\u65f6\u5019\uff0c\u4f1a\u6821\u6b63\u5e26\u6709 key \u7684\u7ec4\u4ef6\uff0c\u6846\u67b6\u4f1a\u786e\u4fdd\u4ed6\u4eec\u88ab\u91cd\u65b0\u6392\u5e8f\uff0c\u800c\u4e0d\u662f\u91cd\u65b0\u521b\u5efa\uff0c\u4ee5\u786e\u4fdd\u4f7f\u7ec4\u4ef6\u4fdd\u6301\u81ea\u8eab\u7684\u72b6\u6001\uff0c\u5e76\u4e14\u63d0\u9ad8\u5217\u8868\u6e32\u67d3\u65f6\u7684\u6548\u7387\u3002<\/p>\n
\u5982\u4e0d\u63d0\u4f9b wx:key\uff0c\u4f1a\u62a5\u4e00\u4e2a warning\uff0c \u5982\u679c\u660e\u786e\u77e5\u9053\u8be5\u5217\u8868\u662f\u9759\u6001\uff0c\u6216\u8005\u4e0d\u5fc5\u5173\u6ce8\u5176\u987a\u5e8f\uff0c\u53ef\u4ee5\u9009\u62e9\u5ffd\u7565\u3002<\/p>\n
\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
<\/p>\n
<switch> {{item.id}} <\/switch><button> Switch <\/button>\r\n<button> Add to the front <\/button>\r\n\r\n<switch> {{item}} <\/switch><button> Add to the front <\/button><\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
<\/p>\n
Page({\r\n data: {\r\n objectArray: [\r\n  {id: 5, unique: 'unique_5'},\r\n  {id: 4, unique: 'unique_4'},\r\n  {id: 3, unique: 'unique_3'},\r\n  {id: 2, unique: 'unique_2'},\r\n  {id: 1, unique: 'unique_1'},\r\n  {id: 0, unique: 'unique_0'},\r\n ],\r\n numberArray: [1, 2, 3, 4]\r\n },\r\n switch: function(e) {\r\n const length = this.data.objectArray.length\r\n for (let i = 0; i <p><strong>2.\u4e0b\u62c9\u5237\u65b0<\/strong><\/p><p>\u5c0f\u7a0b\u5e8f\u9875\u9762\u96c6\u6210\u4e86\u4e0b\u62c9\u529f\u80fd\uff0c\u5e76\u63d0\u4f9b\u4e86\u63a5\u53e3\uff0c\u6211\u4eec\u53ea\u9700\u8981\u4e00\u4e9b\u914d\u7f6e\u5c31\u53ef\u4ee5\u62ff\u5230\u4e8b\u4ef6\u7684\u56de\u8c03\u3002<\/p><p>1. \u9700\u8981\u5728 .json \u6587\u4ef6\u4e2d\u914d\u7f6e\u3002(.json \u6587\u4ef6\u7684\u683c\u5f0f\u548c app.json\u4e0e\u5177\u4f53\u9875\u9762\u7684.json\u6587\u4ef6\u7684\u533a\u522b\uff0c\u524d\u6587\u5df2\u7ecf\u8bb2\u8fc7\uff0c\u6709\u7591\u95ee\u7684\u53ef\u4ee5\u79fb\u6b65\u3002) \u5982\u679c\u914d\u7f6e\u5728app.json\u6587\u4ef6\u4e2d\uff0c\u90a3\u4e48\u6574\u4e2a\u7a0b\u5e8f\u90fd\u53ef\u4ee5\u4e0b\u62c9\u5237\u65b0\u3002\u5982\u679c\u5199\u5728\u5177\u4f53\u9875\u9762\u7684.json\u6587\u4ef6\u4e2d\uff0c\u90a3\u4e48\u5c31\u662f\u5bf9\u5e94\u7684\u9875\u9762\uff0c\u53ef\u4ee5\u4e0b\u62c9\u5237\u65b0\u3002<\/p><p>\u5177\u4f53\u9875\u9762\u7684.json\u6587\u4ef6\uff1a<\/p><p class=\"jb51code\"><br><\/p><pre class=\"brush:js;\">{\r\n \"enablePullDownRefresh\": true\r\n}<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
app.json\u6587\u4ef6:<\/p>\n
<\/p>\n
\"window\": {\r\n \"enablePullDownRefresh\": true\r\n }<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
2. \u5728js\u6587\u4ef6\u4e2d\u6dfb\u52a0\u56de\u8c03\u51fd\u6570<\/p>\n
<\/p>\n
 \/\/ \u4e0b\u62c9\u5237\u65b0\u56de\u8c03\u63a5\u53e3\r\n onPullDownRefresh: function () {\r\n  \/\/ do somthing\r\n },<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
3. \u6dfb\u52a0\u6570\u636e<\/p>\n
\u901a\u5e38\u60c5\u51b5\u4e0b\u7684\u4e0b\u62c9\u5237\u65b0\u64cd\u4f5c\uff0c\u5c31\u662f\u628a\u67e5\u8be2\u6761\u4ef6\u91cd\u7f6e\uff0c\u8ba9\u9875\u9762\u663e\u793a\u6700\u65b0\u7684\u4e00\u9875\u6570\u636e\u3002\u4e0b\u9762\u662f\u7b14\u8005demo\u4e2d\u7684\u4e0b\u62c9\u5237\u65b0\u56de\u8c03\u63a5\u53e3\u7684\u4ee3\u7801\uff0c\u540c\u65f6\u4e5f\u662f\u4e00\u822c\u60c5\u51b5\u4e0b\u7684\u64cd\u4f5c\u6d41\u7a0b\u3002<\/p>\n
<\/p>\n
 \/\/ \u4e0b\u62c9\u5237\u65b0\u56de\u8c03\u63a5\u53e3\r\n onPullDownRefresh: function () {\r\n  \/\/ \u6211\u4eec\u7528total\u548ccount\u6765\u63a7\u5236\u5206\u9875\uff0ctotal\u4ee3\u8868\u5df2\u8bf7\u6c42\u6570\u636e\u7684\u603b\u6570\uff0ccount\u4ee3\u8868\u6bcf\u6b21\u8bf7\u6c42\u7684\u4e2a\u6570\u3002\r\n  \/\/ \u5237\u65b0\u65f6\u9700\u628atotal\u91cd\u7f6e\u4e3a0\uff0c\u4ee3\u8868\u91cd\u65b0\u4ece\u7b2c\u4e00\u6761\u8bf7\u6c42\u3002\r\n  total = 0; \r\n  \/\/ this.data.dataArray \u662f\u9875\u9762\u4e2d\u7ed1\u5b9a\u7684\u6570\u636e\u6e90\r\n  this.data.dataArray = [];\r\n  \/\/ \u7f51\u7edc\u8bf7\u6c42\uff0c\u91cd\u65b0\u8bf7\u6c42\u4e00\u904d\u6570\u636e\r\n  this.periphery();\r\n  \/\/ \u5c0f\u7a0b\u5e8f\u63d0\u4f9b\u7684api\uff0c\u901a\u77e5\u9875\u9762\u505c\u6b62\u4e0b\u62c9\u5237\u65b0\u6548\u679c\r\n  wx.stopPullDownRefresh;\r\n },<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
3 .\u4e0a\u62c9\u52a0\u8f7d<\/strong><\/p>\n
\u540c\u4e0b\u62c9\u5237\u65b0\u4e00\u6837\uff0c\u5c0f\u7a0b\u5e8f\u4e2d\u4e5f\u63d0\u4f9b\u4e86\u7528\u4e8e\u4e0a\u62c9\u65f6\u56de\u8c03\u7684\u63a5\u53e3\u3002\u5b98\u65b9\u6587\u6863\u4e2d\u5e76\u6ca1\u6709\u5f88\u8be6\u7ec6\u7684\u4ecb\u7ecd\uff0c\u7ecf\u6d4b\u8bd5\u53d1\u73b0\uff0c\u4e0a\u62c9\u56de\u8c03\u7684\u63a5\u53e3\u5e76\u4e0d\u9700\u8981\u989d\u5916\u7684\u914d\u7f6e\uff08\u4e0b\u62c9\u65f6\u9700\u8981\u5728 .json\u6587\u4ef6\u4e2d\u914d\u7f6e “enablePullDownRefresh”: true\uff09\uff0c\u76f4\u63a5\u5728\u9875\u9762\u6ed1\u52a8\u5230\u5e95\u90e8\u65f6\u5c31\u80fd\u62ff\u5230\u56de\u8c03\u3002<\/p>\n
1. \u5728js\u6587\u4ef6\u4e2d\u6dfb\u52a0\u56de\u8c03\u51fd\u6570<\/p>\n
<\/p>\n
 \/\/ \u4e0a\u62c9\u52a0\u8f7d\u56de\u8c03\u63a5\u53e3\r\n onReachBottom: function () {\r\n  \/\/ \u6211\u4eec\u7528total\u548ccount\u6765\u63a7\u5236\u5206\u9875\uff0ctotal\u4ee3\u8868\u5df2\u8bf7\u6c42\u6570\u636e\u7684\u603b\u6570\uff0ccount\u4ee3\u8868\u6bcf\u6b21\u8bf7\u6c42\u7684\u4e2a\u6570\u3002\r\n  \/\/ \u4e0a\u62c9\u65f6\u9700\u628atotal\u5728\u539f\u6765\u7684\u57fa\u7840\u4e0a\u52a0\u4e0acount\uff0c\u4ee3\u8868\u4ececount\u6761\u540e\u7684\u6570\u636e\u5f00\u59cb\u8bf7\u6c42\u3002\r\n  total += count;\r\n  \/\/ \u7f51\u7edc\u8bf7\u6c42\r\n  this.periphery();\r\n },<\/pre>\n
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