{"id":120,"date":"2010-09-30T10:27:49","date_gmt":"2010-09-30T10:27:49","guid":{"rendered":"http:\/\/enjoyasp.net\/?p=120"},"modified":"2010-09-30T10:36:36","modified_gmt":"2010-09-30T10:36:36","slug":"js%e6%8b%be%e9%81%97-1","status":"publish","type":"post","link":"https:\/\/enjoyasp.net\/index.php\/2010\/09\/30\/js%e6%8b%be%e9%81%97-1\/","title":{"rendered":"JS\u62fe\u9057 1"},"content":{"rendered":"<p>1\uff0c\u6570\u636e\u8f6c\u6362<\/p>\n<ul>\n<li style=\"color: #000000;\"><span style=\"font-size: x-small;\"><span>\u8f6c\u6362\u4e3a\u5b57\u7b26\u578b\uff1aString();?\u4f8b\uff1aString(<\/span><span>678<\/span><span>)\u7684\u7ed3\u679c\u4e3a<\/span><span>&#8220;678&#8221;<\/span><span>??<\/span><\/span><\/li>\n<li style=\"color: #000000;\"><span style=\"font-size: x-small;\"><span>2<\/span><span>.\u8f6c\u6362\u4e3a\u6570\u503c\u578b\uff1aNumber();?\u4f8b\uff1aNumber(<\/span><span>&#8220;678&#8221;<\/span><span>)\u7684\u7ed3\u679c\u4e3a<\/span><span>678<\/span><span>??<\/span><\/span><\/li>\n<li><span style=\"font-size: x-small;\"><span style=\"color: #000000;\">3<\/span><span style=\"color: #000000;\">.\u8f6c\u6362\u4e3a\u5e03\u5c14\u578b\uff1aBoolean();?\u4f8b\uff1aBoolean(<\/span><span style=\"color: #000000;\">&#8220;aaa&#8221;<\/span><span style=\"color: #000000;\">)\u7684\u7ed3\u679c\u4e3a<\/span><span style=\"color: #000000;\"><strong><\/strong><\/span><\/span><span><span style=\"font-size: x-small;\"><span style=\"color: #000000;\">true<\/span><\/span><\/span><\/li>\n<\/ul>\n<p><span>2, \u4e00\u4e2a\u503c\u4e2d\u63d0\u53d6\u53e6\u4e00\u79cd\u7c7b\u578b\u7684\u503c<\/span><\/p>\n<ul style=\"color: #000000;\">\n<li><span>\u63d0\u53d6\u5b57\u7b26\u4e32\u4e2d\u7684\u6574\u6570\uff1aparseInt();?\u4f8b\uff1aparseInt(<\/span><span>&#8220;123zhang&#8221;<\/span><span>)\u7684\u7ed3\u679c\u4e3a<\/span><span>123<\/span><span><br \/>\n<\/span><\/li>\n<li><span>\u63d0\u53d6\u5b57\u7b26\u4e32\u4e2d\u7684\u6d6e\u70b9\u6570\uff1aparseFloat();?\u4f8b\uff1aparseFloat(<\/span><span>&#8220;0.55zhang&#8221;<\/span><span>)\u7684\u7ed3\u679c\u4e3a<\/span><span>0.55<\/span><span>?<br \/>\n<\/span><\/li>\n<\/ul>\n<p>3, \u8fd0\u884c\u5b57\u7b26\u4e32\u6307\u5b9a\u7684\u51fd\u6570 &#8211; <span style=\"color: #ff0000;\">EVAL<\/span><\/p>\n<ol>\n<li><span>\u6267\u884c\u7528\u5b57\u7b26\u4e32\u8868\u793a\u7684\u4e00\u6bb5javascript\u4ee3\u7801\uff1aeval();?\u4f8b\uff1azhang=eval(<\/span><span><span style=\"color: #0000ff;\">&#8220;1+1&#8221;<\/span><\/span><span>)\u7684\u7ed3\u679czhang=<\/span><span><span style=\"color: #c00000;\">2<\/span><\/span><span>?<br \/>\n<\/span><\/li>\n<\/ol>\n<p>4, \u53d8\u91cf\u6307\u5b9a\u53ef\u6307\u5b9a\u4e3a\u65b9\u6cd5\uff0c<span style=\"color: #000000;\"> \/\/js\u65b9\u6cd5<span style=\"color: #ff0000;\">\u5f62\u53c2\u4e0d\u7528var<\/span> \u76f4\u63a5\u6307\u5b9a\u4e00\u4e2a\u540d\u5b57\u5373\u53ef\u5982\uff1afunction doit( username ){}<br \/>\n?<\/span><span style=\"color: #0000ff;\">var<\/span><span style=\"color: #000000;\">?myfunc?<\/span><span style=\"color: #000000;\">=<\/span><span style=\"color: #000000;\">?<\/span><span style=\"color: #0000ff;\">function<\/span><span style=\"color: #000000;\">?()<br \/>\n????????{<br \/>\n????????????alert(<\/span><span style=\"color: #000000;\">&#8220;<\/span><span style=\"color: #000000;\">hello<\/span><span style=\"color: #000000;\">&#8220;<\/span><span style=\"color: #000000;\">);<br \/>\n????????};<br \/>\n?js\u6ca1\u6709\u7c7b\uff0c\u4f46\u53ef\u7528{} \u6765\u521b\u5efa\uff0c\u5e76\u53ef\u6307\u5b9a\u65b9\u6cd5\u3002\u5982\uff1a var s = {}; ? 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