\u5bf9\u4e8e\u4e00\u95e8\u8bed\u8a00\u7684\u5b66\u4e60\uff0c\u6211\u60f3\u7b2c\u4e00\u6b65\u5e94\u8be5\u662f\u719f\u6089\u5176\u57fa\u672c\u8bed\u6cd5\uff0c\u7136\u540e\u518d\u4f7f\u7528\u7684\u8fc7\u7a0b\u4e2d\u624d\u80fd\u591f\u4e0d\u964c\u751f\u3002
\n\u8f6f\u4ef6\u5c31\u662f\u4e00\u5957\u590d\u6742\u7684\u903b\u8f91\u7cfb\u7edf\uff0c\u5728\u8fd9\u5957\u590d\u6742\u7684\u7cfb\u7edf\u91cc\u5305\u542b\u4e86\u65e0\u6570\u7684\u5c0f\u7cfb\u7edf\uff0c\u4ed6\u4eec\u76f8\u4e92\u72ec\u7acb\u53c8\u591a\u6709\u8054\u7cfb\uff0c\u800c\u4f7f\u7528\u4ec0\u4e48\u8bed\u8a00\u6765\u7f16\u5199\u5c31\u7531\u4f60\u6765\u51b3\u5b9a\u3002
\njavascript\u662f\u4e00\u95e8\u811a\u672c\u8bed\u8a00\uff0c\u5979\u7684\u8bed\u6cd5\u89c4\u5219\u548c\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u6709\u4e9b\u662f\u7c7b\u4f3c\u7684\uff0c\u57fa\u672c\u5143\u7d20\u90fd\u5dee\u4e0d\u591a\u3002<\/p>\n
\u4e00 javaScript\u4e94\u8981\u7d20\uff1a<\/b><\/p>\n
\u53d8\u91cf
\n\u64cd\u4f5c\u6570\uff08\u6570\u636e \u7c7b\u578b\uff09
\n\u64cd\u4f5c\u7b26 \uff08\u8fd0\u7b97\u7b26\uff09
\n\u63a7\u5236\u8bed\u53e5
\n\u51fd\u6570<\/p>\n
\u4e8c \u5bf9\u4e94\u8981\u7d20\u7684\u4e2a\u4eba\u7406\u89e3\uff1a<\/b><\/p>\n
\u53d8\u91cf<\/b>
\n\u5728\u7f16\u7a0b\u4e2d\u4f7f\u7528\u9891\u7387\u6700\u9ad8\u7684\u5e94\u8be5\u662f\u53d8\u91cf\uff0c\u5979\u65e0\u5904\u4e0d\u5728\uff0c\u968f\u624b\u5199\u6765\uff0c\u597d\u50cf\u5979\u672c\u8eab\u5c31\u5728\uff0c\u5979\u53d8\u5316\u4e07\u5343\uff0c\u5316\u8eab\u6210\u5404\u5f0f\u5404\u6837\u3002 \u9996\u5148js\u4e2d\u662f\u533a\u5206\u5927\u5c0f\u5199\u7684\uff0c\u58f0\u660e\u53d8\u91cf\u683c\u5f0f\uff1a
\nvar name = “xiaoming”;<\/p>\n
var age = 19;<\/p>\n
\u4ece\u4e0a\u9762\u4f8b\u5b50\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0c\u53d8\u91cf\u662f\u53ef\u4ee5\u88ab\u8d4b\u4e88\u503c\u7684\uff0c\u53ef\u4ee5\u7406\u89e3\u6210\u4ed6\u662f\u4e00\u4e2a\u7a7a\u95f4\u540d\u5b57\uff0c\u62e5\u6709\u8fd9\u4e2a\u540d\u5b57\u7684\u7a7a\u95f4\u5b58\u50a8\u7740\u6307\u5b9a\u7684\u8fd9\u6761\u6570\u636e\uff0c\u6240\u6709\u6570\u636e\u7c7b\u578b\u7684\u6570\u636e\u90fd\u53ef\u4ee5\u7528\u53d8\u91cf\u6765\u4fdd\u5b58\u3002<\/p>\n
\u64cd\u4f5c\u6570\uff08\u6570\u636e \u7c7b\u578b\uff09<\/b>
\n\u6211\u4eec\u7f16\u5199\u7a0b\u5e8f\u7684\u76ee\u7684\u5c31\u662f\u4f20\u8f93\u6570\u636e\uff08\u64cd\u4f5c\u6570\uff09\uff0c\u5b58\u50a8\u8bfb\u53d6\u7b49\u4e00\u7cfb\u5217\u7684\u64cd\u4f5c\u90fd\u662f\u5efa\u7acb\u5728\u6570\u636e\u4e4b\u4e0a\uff0c\u53ef\u4ee5\u8bf4\uff0c\u6ca1\u6709\u6570\u636e\uff08\u64cd\u4f5c\u6570\uff09\u5c31\u6ca1\u6709\u7a0b\u5e8f\u5b58\u5728\u7684\u4ef7\u503c\uff1b
\n\u5728js\u4e2d\uff0c\u6570\u636e\u7c7b\u578b\u5206\u4e3a\u516d\u79cd\uff1a<\/p>\n
Number \u6570\u503c\u578b
\nString \u5b57\u7b26\u4e32\u578b
\nBoolean \u5e03\u5c14\u578b
\nUndefined \u672a\u5b9a\u4e49
\nNULL \u7a7a \u7279\u6b8a\u7c7b\u578b
\nobject \u5bf9\u8c61\u578b<\/p>\n
\u5728\u7f16\u7a0b\u5de5\u4f5c\u4e2d\uff0c\u6211\u4eec\u5c31\u662f\u4e00\u76f4\u5bf9\u4ee5\u4e0a\u51e0\u79cd\u7c7b\u578b\u7684\u6570\u636e\u8fdb\u884c\u64cd\u4f5c\u3001\u8fd0\u7b97\uff0c\u505a\u6210\u4e00\u4e2a\u4e2a\u590d\u6742\u7684\u903b\u8f91\u3002<\/p>\n
\u64cd\u4f5c\u7b26 \uff08\u8fd0\u7b97\u7b26\uff09<\/b>
\n\u64cd\u4f5c\u7b26\u548c\u64cd\u4f5c\u6570\u662f\u4e24\u4e2a\u4e0d\u53ef\u5206\u5272\u53c8\u76f8\u4e92\u72ec\u7acb\u7684\u5b58\u5728\uff0c\u56e0\u4e3a\u5c06\u6570\u636e\u8fdb\u884c\u8fd0\u7b97\u624d\u80fd\u83b7\u5f97\u6211\u4eec\u60f3\u8981\u7ed3\u679c\uff0c\u6240\u4ee5\u64cd\u4f5c\u7b26\u662f\u64cd\u4f5c\u6570\u7684\u5144\u5f1f\uff0c\u4ed6\u4eec\u4e00\u8d77\u6210\u957f\uff0c\u4e00\u8d77\u53d8\u5316\uff0c\u4e0d\u53ef\u6216\u7f3a\u3002
\n\u8fd0\u7b97\u7b26\u6709\u5f88\u591a\uff0c\u6700\u5e38\u7528\u7684\u6709(\u6309\u4f18\u5148\u7ea7\u6392\u5e8f\uff09\uff1a
\n() [] {} ++ — * \/ % + – < <= >= == != === !== & | && || ?: = *= \/= += -= ,<\/p>\n
\u63a7\u5236\u8bed\u53e5 <\/b>
\n\u5728\u5bf9\u6570\u636e\u8fdb\u884c\u8fd0\u7b97\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u5faa\u73af\u5224\u65ad\u7b49\u4e00\u7cfb\u5217\u7684\u63a7\u5236\u6765\u8fbe\u5230\u6211\u4eec\u7684\u76ee\u7684\uff0c\u6240\u4ee5\u8ba9\u6570\u636e\u8fd0\u7b97\u5728\u6211\u4eec\u7ed9\u5b9a\u7684\u63a7\u5236\u4e2d\u8fdb\u884c\uff0c\u8fd9\u5c31\u5f62\u6210\u4e86\u4e00\u5957\u5b8c\u6574\u7684\u903b\u8f91\u4f53\u7cfb\uff0c\u56e0\u6b64\u6211\u89c9\u5f97\u662f\u53d8\u91cf\u3001\u64cd\u4f5c\u6570\u3001\u64cd\u4f5c\u7b26\u3001\u63a7\u5236\u8bed\u53e5\u8fd9\u56db\u4e2a\u5143\u7d20\u662f\u6700\u57fa\u672c\u7684\u8bed\u6cd5\u3002
\n\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d\u6700\u5e38\u7528\u4e5f\u662f\u6700\u91cd\u8981\u7684\u63a7\u5236\u8bed\u53e5\u5e94\u8be5\u5c31\u662f\u5224\u65ad\u548c\u5faa\u73af\u4e86\uff1a
\n\u4e00 \u5faa\u73af\u8bed\u53e5
\n\u5b9e\u7528\u573a\u666f\uff1a1\u5728\u7ed9\u5b9a\u6761\u4ef6\u4e0b\u91cd\u590d\u7684\u505a\u4e00\u4ef6\u4e8b\u60c5 2\u904d\u5386\u6570\u7ec4
\n\u5faa\u73af\u8bed\u53e5\u8bed\u6cd5\u6709\u591a\u79cd\uff0c\u6211\u89c9\u5f97\u5b66\u4e60\u521d\u671f\u6bcf\u4e2a\u7c7b\u578b\u5148\u638c\u63e1\u4e00\u79cd\uff0c\u719f\u7ec3\u4e4b\u540e\u518d\u770b\u5176\u4ed6\uff0c\u63a8\u8350\u4f7f\u7528\u8fd9\u4e24\u79cd\uff1afor\u5faa\u73af\u548cfor..in\u5faa\u73af
\n1 for\u5faa\u73af
\nfor(var i=0;i<10;i++){
\ndocument.write(” i “);
\n}
\n2 \u904d\u5386(\u4ee5\u4e0b\u4ee3\u7801\u53ef\u4ee5\u5c06window\u5bf9\u8c61\u7684\u6240\u6709\u5c5e\u6027\u904d\u5386\u51fa\u6765)
\nfor(var propName in window){
\ndocument.write(propName);
\n}
\n\u4e8c \u6761\u4ef6\u8bed\u53e5
\n\u9700\u8981\u5224\u65ad\u9009\u62e9\u7684\u65f6\u5019\u7528\u5230\u6761\u4ef6\u8bed\u53e5\uff0c\u5e38\u7528\u7684\u6761\u4ef6\u8bed\u53e5\u6709if\u8bed\u53e5\u548cswitch\u8bed\u53e5\u3002if\u8bed\u53e5\u7528\u5728\u9009\u9879\u5c11\uff0c\u903b\u8f91\u6bd4\u8f83\u7b80\u5355\u7684\u573a\u666f\u91cc\uff1bswitch\u8bed\u53e5\u7528\u5728\u9009\u62e9\u9879\u591a\uff0c\u6bd4\u8f83\u590d\u6742\u4e00\u70b9\u7684\u903b\u8f91\u3002
\n1 if \u8bed\u53e5
\nif(i<0){
\nalert(“i \u662f\u8d1f\u6570”);
\n}else{
\nalert(“i \u4e0d\u662f\u8d1f\u6570”);
\n}
\n2 switch \u8bed\u53e5
\nswitch(score){
\ncase score>=90:
\nalert(“\u4f18\u79c0”);
\nbreak;
\ncase score>=70:
\nalert(“\u826f\u597d”);
\nbreak;
\ncase score>=60:
\nalert(“\u53ca\u683c”);
\nbreak;
\ndefault:
\nalert(“\u4e0d\u53ca\u683c”);
\n}
\n\u7528case\u540e\u9762\u7684\u7ed3\u679c\u53bb\u4e0eswitch\u540e\u9762\u62ec\u53f7\u91cc\u9762\u7684\u503c\u5bf9\u6bd4\uff0c\u6bd4\u4e2d\u54ea\u4e2a\u5c31\u6267\u884c\u54ea\u4e2a\uff0c\u6267\u884c\u7ed3\u675f\u5c31\u9000\u51fa\u3002<\/p>\n
\u51fd\u6570 <\/b>
\n\u5f53\u6709\u5f88\u591a\u903b\u8f91\u8981\u5904\u7406\u7684\u65f6\u5019\uff0c\u5c31\u8499\u5708\u4e86\uff0c\u5b8c\u5168\u4e71\u4e86\uff0c\u4e0d\u77e5\u9053\u54ea\u4e2a\u662f\u54ea\u4e2a\uff0c\u4e8e\u662f\u5c31\u51fa\u73b0\u4e86\u51fd\u6570\uff0c\u5979\u5c06\u6211\u4eec\u8fd9\u4e9b\u72ec\u7acb\u7684\u5c0f\u903b\u8f91\u5206\u522b\u5c01\u88c5\u8d77\u6765\u8d77\u4e2a\u540d\u5b57\uff0c\u540e\u9762\u76f4\u63a5\u6309\u7167\u540d\u5b57\u8fdb\u884c\u8c03\u7528\uff0c\u4e00\u5207\u53d8\u5f97\u4e95\u7136\u6709\u5e8f\uff0c\u4fbf\u4e8e\u7ba1\u7406\u3002
\n\u51fd\u6570\u7684\u57fa\u672c\u683c\u5f0f\uff1a
\nfunction Add(num1,num2){
\nreturn num1+num2;
\n}
\n\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2aAdd\u51fd\u6570\uff0c\u5e76\u4e14\u7ed9\u4e86\u4e24\u4e2a\u53c2\u6570\uff0c\u90a3\u6211\u4eec\u5728\u8c03\u7528\u7684\u65f6\u5019\u4f20\u51652\u4e2a\u53c2\u6570\u5c31\u53ef\u4ee5\u5b9e\u73b0\u52a0\u6cd5\u8fd0\u7b97\u4e86\u3002\u5982\uff1a
\nvar res = Add(44,99);
\n\u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u51fd\u6570\uff0c\u58f0\u660e\u51fd\u6570\u7684\u65f6\u5019\uff0c\u62ec\u53f7\u91cc\u9762\u7684\u53c2\u6570\u6211\u4eec\u4e60\u60ef\u79f0\u4e3a\u5f62\u5f0f\u53c2\u6570\uff1b\u8c03\u7528\u65f6\u5019\u4f20\u5165\u7684\u53c2\u6570\u79f0\u4e3a\u5b9e\u9645\u53c2\u6570\u3002\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d\u9700\u8981\u5f88\u591a\u590d\u6742\u7684\u51fd\u6570\uff0c\u90a3\u4e48\u5e94\u8be5\u660e\u767d\u7684\u51e0\u4e2a\u95ee\u9898\uff1a
\n1 \u53c2\u6570\u53ef\u4ee5\u6709\u591a\u4e2a\u4e5f\u53ef\u4ee5\u6ca1\u6709\uff0c\u7528\u9017\u53f7\u9694\u5f00\uff0c\u53ef\u4ee5\u7528arguments\u5bf9\u8c61\u6765\u8bbf\u95ee\u53c2\u6570\uff0c\u6240\u4ee5\u53c2\u6570\u662f\u4e00\u7ec4\u6570\u636e\u3002
\n2 \u8c03\u7528\u7684\u65f6\u5019\u4f20\u5165\u7684\u5b9e\u9645\u53c2\u6570\u4e2a\u6570\u53ef\u4ee5\u4e0e\u58f0\u660e\u65f6\u5019\u7684\u5f62\u5f0f\u53c2\u6570\u7684\u4e2a\u6570\u53ef\u4ee5\u4e0d\u76f8\u7b49\u3002
\n3 \u5982\u679c\u5f62\u53c2\u548c\u5b9e\u53c2\u4e2a\u6570\u4e0d\u76f8\u7b49\uff0c\u7a0b\u5e8f\u4f1a\u6309\u51fa\u573a\u987a\u5e8f\u6328\u7740\u914d\u5bf9\u3002
\n3 \u53ef\u4ee5\u7528arguments.length\u8bed\u53e5\u6765\u67e5\u770b\u53c2\u6570\u7684\u4e2a\u6570\u3002
\n3 \u7a0b\u5e8f\u6267\u884c\u4e2d\u5982\u679c\u9047\u5230return\uff0c\u90a3\u4e48\u6267\u884c\u5b8creturn\u8bed\u53e5\u540e\uff0c\u7a0b\u5e8f\u7ed3\u675f\u3002<\/p>\n
\u6b22\u8fce\u5206\u4eab\u672c\u6587\uff0c\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u51fa\u5904\uff1a\u524d\u7aefABC<\/a> » javascript\u57fa\u672c\u8bed\u6cd5\u7406\u89e3<\/a><\/p>","protected":false},"excerpt":{"rendered":" \u5bf9\u4e8e\u4e00\u95e8\u8bed\u8a00\u7684\u5b66\u4e60\uff0c\u6211\u60f3\u7b2c\u4e00\u6b65\u5e94\u8be5\u662f\u719f\u6089\u5176\u57fa\u672c\u8bed\u6cd5\uff0c\u7136\u540e\u518d\u4f7f\u7528\u7684\u8fc7\u7a0b\u4e2d\u624d\u80fd\u591f\u4e0d\u964c\u751f\u3002 \u8f6f\u4ef6\u5c31\u662f\u4e00\u5957\u590d\u6742\u7684\u903b\u8f91\u7cfb\u7edf\uff0c\u5728\u8fd9\u5957\u590d\u6742\u7684\u7cfb\u7edf\u91cc\u5305\u542b\u4e86\u65e0\u6570\u7684\u5c0f\u7cfb\u7edf\uff0c\u4ed6\u4eec\u76f8\u4e92\u72ec\u7acb\u53c8\u591a\u6709\u8054\u7cfb\uff0c\u800c\u4f7f\u7528\u4ec0\u4e48\u8bed\u8a00\u6765\u7f16\u5199\u5c31\u7531 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[9,371],"_links":{"self":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/2540"}],"collection":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2540"}],"version-history":[{"count":1,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/2540\/revisions"}],"predecessor-version":[{"id":2541,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/2540\/revisions\/2541"}],"wp:attachment":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2540"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2540"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2540"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}