{"id":3908,"date":"2024-11-10T11:21:45","date_gmt":"2024-11-10T03:21:45","guid":{"rendered":"https:\/\/fwq.ai\/blog\/3908\/"},"modified":"2024-11-10T11:21:45","modified_gmt":"2024-11-10T03:21:45","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-apply-%e5%92%8c-call-%e5%9c%a8%e5%87%bd%e6%95%b0%e9%98%b2%e6%8a%96%e6%8a%80%e6%9c%af%e4%b8%ad%e6%94%b9%e5%8f%98-this-%e6%8c%87%e5%90%91%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/3908\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 apply \u548c call \u5728\u51fd\u6570\u9632\u6296\u6280\u672f\u4e2d\u6539\u53d8 this \u6307\u5411\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173116242686811.jpg\" class=\"aligncenter\" title=\"\u5982\u4f55\u4f7f\u7528 apply \u548c call \u5728\u51fd\u6570\u9632\u6296\u6280\u672f\u4e2d\u6539\u53d8 this \u6307\u5411\uff1f\u63d2\u56fe\" alt=\"\u5982\u4f55\u4f7f\u7528 apply \u548c call \u5728\u51fd\u6570\u9632\u6296\u6280\u672f\u4e2d\u6539\u53d8 this \u6307\u5411\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>js\u66f4\u6539this\u6307\u5411\u7684apply\u548ccall<\/strong><\/p>\n<p>\u5728\u51fd\u6570\u4e2d\uff0capply\u548ccall\u88ab\u7528\u4e8e\u6539\u53d8\u51fd\u6570this\u6307\u5411\u3002<\/p>\n<p>\u5728\u4ee3\u7801\u793a\u4f8b\u4e2d\uff1a<\/p>\n<ul>\n<li>apply\u65b9\u6cd5 takes \u5728 this \u4e0a\u4e0b\u6587\u4e2d\u8c03\u7528\u51fd\u6570\uff0c\u5e76\u5c06\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f5c\u4e3a\u53c2\u6570\u5217\u8868\u4f20\u9012\u7ed9\u8be5\u51fd\u6570\u3002\u5728\u9632\u6296\u51fd\u6570\u4e2d\uff0c\u5b83\u7528\u4e8e\u5728 context\u4e0a\u4e0b\u6587\u4e2d\u8c03\u7528 func \u51fd\u6570\uff0c\u5e76\u4f20\u5165 args \u4f5c\u4e3a\u53c2\u6570\u3002<\/li>\n<li>call \u65b9\u6cd5 \u4e0e apply \u7c7b\u4f3c\uff0c\u4f46\u5b83\u63a5\u53d7\u5355\u72ec\u7684\u53c2\u6570\uff0c\u800c\u4e0d\u662f\u6570\u7ec4\u4f5c\u4e3a\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002\u5b83\u4ee5\u4e0d\u4f20\u53c2\u6570\u7ed9\u51fd\u6570\u7684\u65b9\u5f0f\u8c03\u7528\u51fd\u6570\uff0c\u4ec5\u66f4\u6539 this \u6307\u5411\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e9b\u65b9\u6cd5\u7684\u4f7f\u7528\u539f\u56e0\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li> <strong>\u6539\u53d8\u51fd\u6570\u6267\u884c\u7684\u4e0a\u4e0b\u6587\uff1a<\/strong> \u9632\u6296\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u51fd\u6570\uff0c\u5b83\u5c06\u4ee5\u4e0d\u540c\u7684 this \u5bf9\u8c61\u6267\u884c func \u51fd\u6570\u3002apply\u548ccall\u901a\u8fc7\u5c06\u76ee\u6807 this \u5bf9\u8c61\u4f5c\u4e3a\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f20\u9012\uff0c\u5141\u8bb8\u5c06\u4e0d\u540c\u7684 this \u7ed1\u5b9a\u5230\u51fd\u6570\u3002<\/li>\n<li> <strong>\u5ef6\u8fdf\u51fd\u6570\u6267\u884c\uff1a<\/strong> \u9632\u6296\u51fd\u6570\u901a\u8fc7\u4f7f\u7528 setTimeOut \u673a\u5236\u5ef6\u8fdf func \u51fd\u6570\u7684\u6267\u884c\u3002apply\u548ccall\u7528\u4e8e\u786e\u4fdd func \u51fd\u6570\u5728\u5176\u9884\u671f\u4e0a\u4e0b\u6587\u4e2d\u6267\u884c\uff0c\u5373\u4f7f\u9632\u6296\u51fd\u6570\u5ef6\u8fdf\u4e86\u5176\u6267\u884c\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u4f7f\u7528 apply \u548c call \u5728\u51fd\u6570\u4e2d\u6539\u53d8 this \u6307\u5411\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>js\u66f4\u6539this\u6307\u5411\u7684apply\u548ccall \u5728\u51fd\u6570\u4e2d\uff0capply\u548ccall\u88ab\u7528\u4e8e\u6539\u53d8\u51fd\u6570this\u6307\u5411\u3002 \u5728\u4ee3\u7801\u793a\u4f8b\u4e2d\uff1a apply\u65b9\u6cd5 takes \u5728 this \u4e0a\u4e0b\u6587\u4e2d\u8c03\u7528\u51fd\u6570\uff0c\u5e76\u5c06\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f5c\u4e3a\u53c2\u6570\u5217\u8868\u4f20\u9012\u7ed9\u8be5\u51fd\u6570\u3002\u5728\u9632\u6296\u51fd\u6570\u4e2d\uff0c\u5b83\u7528\u4e8e\u5728 context\u4e0a\u4e0b\u6587\u4e2d\u8c03\u7528 func \u51fd\u6570\uff0c\u5e76\u4f20\u5165 args \u4f5c\u4e3a\u53c2\u6570\u3002 call \u65b9\u6cd5 \u4e0e apply \u7c7b\u4f3c\uff0c\u4f46\u5b83\u63a5\u53d7\u5355\u72ec\u7684\u53c2\u6570\uff0c\u800c\u4e0d\u662f\u6570\u7ec4\u4f5c\u4e3a\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002\u5b83\u4ee5\u4e0d\u4f20\u53c2\u6570\u7ed9\u51fd\u6570\u7684\u65b9\u5f0f\u8c03\u7528\u51fd\u6570\uff0c\u4ec5\u66f4\u6539 this \u6307\u5411\u3002 \u8fd9\u4e9b\u65b9\u6cd5\u7684\u4f7f\u7528\u539f\u56e0\u5982\u4e0b\uff1a \u6539\u53d8\u51fd\u6570\u6267\u884c\u7684\u4e0a\u4e0b\u6587\uff1a \u9632\u6296\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u51fd\u6570\uff0c\u5b83\u5c06\u4ee5\u4e0d\u540c\u7684 this \u5bf9\u8c61\u6267\u884c func \u51fd\u6570\u3002apply\u548ccall\u901a\u8fc7\u5c06\u76ee\u6807 this \u5bf9\u8c61\u4f5c\u4e3a\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f20\u9012\uff0c\u5141\u8bb8\u5c06\u4e0d\u540c\u7684 this \u7ed1\u5b9a\u5230\u51fd\u6570\u3002 \u5ef6\u8fdf\u51fd\u6570\u6267\u884c\uff1a \u9632\u6296\u51fd\u6570\u901a\u8fc7\u4f7f\u7528 setTimeOut \u673a\u5236\u5ef6\u8fdf func \u51fd\u6570\u7684\u6267\u884c\u3002apply\u548ccall\u7528\u4e8e\u786e\u4fdd func \u51fd\u6570\u5728\u5176\u9884\u671f\u4e0a\u4e0b\u6587\u4e2d\u6267\u884c\uff0c\u5373\u4f7f\u9632\u6296\u51fd\u6570\u5ef6\u8fdf\u4e86\u5176\u6267\u884c\u3002 \u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u4f7f\u7528 apply \u548c call \u5728\u51fd\u6570\u4e2d\u6539\u53d8 this 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