{"id":408,"date":"2020-02-14T14:07:00","date_gmt":"2020-02-14T06:07:00","guid":{"rendered":"https:\/\/blog.cqdefxxx.com\/?p=408"},"modified":"2020-02-14T14:07:00","modified_gmt":"2020-02-14T06:07:00","slug":"%e6%95%b0%e6%8d%ae%e3%80%81%e5%8f%98%e9%87%8f%e3%80%81%e5%86%85%e5%ad%98","status":"publish","type":"post","link":"https:\/\/blog.viter.top\/index.php\/2020\/02\/14\/%e6%95%b0%e6%8d%ae%e3%80%81%e5%8f%98%e9%87%8f%e3%80%81%e5%86%85%e5%ad%98\/","title":{"rendered":"\u6570\u636e\u3001\u53d8\u91cf\u3001\u5185\u5b58"},"content":{"rendered":"
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<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n  <meta charset=\"UTF-8\">\n  <title>\u5173\u4e8e\u8d4b\u503c\u548c\u5185\u5b58\u7684\u95ee\u9898<\/title>\n<\/head>\n<body>\n<!--\n  \u95ee\u9898: var a = xxx, a\u5185\u5b58\u4e2d\u5230\u5e95\u4fdd\u5b58\u7684\u662f\u4ec0\u4e48?\n    * xxx\u662f\u57fa\u672c\u6570\u636e, \u4fdd\u5b58\u7684\u5c31\u662f\u8fd9\u4e2a\u6570\u636e\n    * xxx\u662f\u5bf9\u8c61, \u4fdd\u5b58\u7684\u662f\u5bf9\u8c61\u7684\u5730\u5740\u503c\n    * xxx\u662f\u4e00\u4e2a\u53d8\u91cf, \u4fdd\u5b58\u7684xxx\u7684\u5185\u5b58\u5185\u5bb9(\u53ef\u80fd\u662f\u57fa\u672c\u6570\u636e, \u4e5f\u53ef\u80fd\u662f\u5730\u5740\u503c)\n-->\n<script type=\"text\/javascript\">\n  var a = 3\n  a = function () {\n\n  }\n\n  var b = 'abc'\n  a = b\n  b = {}\n  a = b\n\n\n\n<\/script>\n<\/body>\n<\/html><\/code><\/pre>\n
<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n  <meta charset=\"UTF-8\">\n  <title>02_\u5173\u4e8e\u5f15\u7528\u53d8\u91cf\u8d4b\u503c\u95ee\u9898<\/title>\n<\/head>\n<body>\n<!--\n\u5173\u4e8e\u5f15\u7528\u53d8\u91cf\u8d4b\u503c\u95ee\u9898\n  * 2\u4e2a\u5f15\u7528\u53d8\u91cf\u6307\u5411\u540c\u4e00\u4e2a\u5bf9\u8c61, \u901a\u8fc7\u4e00\u4e2a\u53d8\u91cf\u4fee\u6539\u5bf9\u8c61\u5185\u90e8\u6570\u636e, \u53e6\u4e00\u4e2a\u53d8\u91cf\u770b\u5230\u7684\u662f\u4fee\u6539\u4e4b\u540e\u7684\u6570\u636e\n  * 2\u4e2a\u5f15\u7528\u53d8\u91cf\u6307\u5411\u540c\u4e00\u4e2a\u5bf9\u8c61, \u8ba9\u5176\u4e2d\u4e00\u4e2a\u5f15\u7528\u53d8\u91cf\u6307\u5411\u53e6\u4e00\u4e2a\u5bf9\u8c61, \u53e6\u4e00\u5f15\u7528\u53d8\u91cf\u4f9d\u7136\u6307\u5411\u524d\u4e00\u4e2a\u5bf9\u8c61\n-->\n<script type=\"text\/javascript\">\n  var obj1 = {name: 'Tom'}\n  var obj2 = obj1\n  obj2.age = 12\n  console.log(obj1.age)  \/\/ 12\n  function fn (obj) {\n    obj.name = 'A'\n  }\n  fn(obj1)\n  console.log(obj2.name) \/\/A\n\n\n  var a = {age: 12}\n  var b = a\n  a = {name: 'BOB', age: 13}\n  b.age = 14\n  console.log(b.age, a.name, a.age) \/\/ 14 Bob 13\n\n  function fn2 (obj) {\n    obj = {age: 15}\n  }\n  fn2(a)\n\n  console.log(a.age)\n\n\n\n\n<\/script>\n<\/body>\n<\/html><\/code><\/pre>\n
<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n  <meta charset=\"UTF-8\">\n  <title>02_\u5173\u4e8e\u6570\u636e\u4f20\u9012\u95ee\u9898<\/title>\n<\/head>\n<body>\n<!--\n\u95ee\u9898: \u5728js\u8c03\u7528\u51fd\u6570\u65f6\u4f20\u9012\u53d8\u91cf\u53c2\u6570\u65f6, \u662f\u503c\u4f20\u9012\u8fd8\u662f\u5f15\u7528\u4f20\u9012\n  * \u7406\u89e31: \u90fd\u662f\u503c(\u57fa\u672c\/\u5730\u5740\u503c)\u4f20\u9012\n  * \u7406\u89e32: \u53ef\u80fd\u662f\u503c\u4f20\u9012, \u4e5f\u53ef\u80fd\u662f\u5f15\u7528\u4f20\u9012(\u5730\u5740\u503c)\n-->\n<script type=\"text\/javascript\">\n  var a = 3\n  function fn (a) {\n    a = a +1\n  }\n  fn(a)\n  console.log(a)\n\n  function fn2 (obj) {\n    console.log(obj.name)\n    obj.name = \"xxx\"\n  }\n  var obj = {name: 'Tom'}\n  fn2(obj)\n  console.log(obj.name)\n<\/script>\n<\/body>\n<\/html><\/code><\/pre>\n
<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n  <meta charset=\"UTF-8\">\n  <title>02_\u5185\u5b58\u7ba1\u7406<\/title>\n<\/head>\n<body>\n<!--\n\u95ee\u9898: JS\u5f15\u64ce\u5982\u4f55\u7ba1\u7406\u5185\u5b58?\n1. \u5185\u5b58\u751f\u547d\u5468\u671f\n  * \u5206\u914d\u5c0f\u5185\u5b58\u7a7a\u95f4, \u5f97\u5230\u5b83\u7684\u4f7f\u7528\u6743\n  * \u5b58\u50a8\u6570\u636e, \u53ef\u4ee5\u53cd\u590d\u8fdb\u884c\u64cd\u4f5c\n  * \u91ca\u653e\u5c0f\u5185\u5b58\u7a7a\u95f4\n2. \u91ca\u653e\u5185\u5b58\n  * \u5c40\u90e8\u53d8\u91cf: \u51fd\u6570\u6267\u884c\u5b8c\u81ea\u52a8\u91ca\u653e\n  * \u5bf9\u8c61: \u6210\u4e3a\u5783\u573e\u5bf9\u8c61==>\u5783\u573e\u56de\u6536\u5668\u56de\u6536\n-->\n<script type=\"text\/javascript\">\n  var a = 3\n  var obj = {}\n  obj = undefined\n\n  function fn () {\n    var b = {}\n  }\n\n  fn() \/\/ b\u662f\u81ea\u52a8\u91ca\u653e, b\u6240\u6307\u5411\u7684\u5bf9\u8c61\u662f\u5728\u540e\u9762\u7684\u67d0\u4e2a\u65f6\u523b\u7531\u5783\u573e\u56de\u6536\u5668\u56de\u6536\n<\/script>\n<\/body>\n<\/html><\/code><\/pre>\n
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