{"id":3421,"date":"2010-12-11T02:39:57","date_gmt":"2010-12-10T18:39:57","guid":{"rendered":"http:\/\/wp.chunhsin.idv.tw\/?p=3421"},"modified":"2010-12-11T02:44:38","modified_gmt":"2010-12-10T18:44:38","slug":"%e4%bd%bf%e7%94%a8javascript%e8%a7%b8%e7%99%bcchange%e4%ba%8b%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/wp.chunhsin.idv.tw\/?p=3421","title":{"rendered":"\u4f7f\u7528javascript\u89f8\u767cchange\u4e8b\u4ef6"},"content":{"rendered":"

\u96d6\u7136\u662f\u4ee5change\u4e8b\u4ef6\u4f5c\u70ba\u4e3b\u984c\uff0c\u4e0d\u904e\u5176\u4ed6\u4e8b\u4ef6\u61c9\u8a72\u90fd\u9069\u7528\u3002\u5148\u8aaajQuery\u89f8\u767c\u7269\u4ef6\u7684change\u65b9\u5f0f\uff0c\u56e0\u70ba\u5f88\u76f4\u89ba\u3002<\/p>\n

\u5229\u7528jQuery\u7684selector\u53d6\u5f97\u7269\u4ef6\u4e4b\u5f8c\uff0c\u7136\u5f8c\u57f7\u884c\u7269\u4ef6\u7684change()\u65b9\u6cd5\u5c31\u53ef\u4ee5\u89f8\u767c\u7269\u4ef6\u7684change\u4e8b\u4ef6\u3002\u4f8b\u5982$(“#ddd”).change()\u3002<\/p>\n

\u800c\u5229\u7528javascript\u53bb\u89f8\u767c\u67d0\u4e00\u500bdom\u7269\u4ef6\u7684change\u4e8b\u4ef6\u6709\u4e00\u9ede\u5c0f\u9ebb\u7169\uff0c\u800c\u4e14\u5fc5\u9808\u5206\u6210\u5169\u7a2e\u72c0\u6cc1\u4f86\u8b1b\u3002<\/p>\n

\u7b2c\u4e00\u7a2e\u6bd4\u8f03\u7c21\u55ae\uff0c\u53ea\u4e0d\u904e\u770b\u8d77\u4f86\u6709\u9ede\u5947\u602a\u3002\u4e00\u822c\u7528\u7d14javascript\u8a9e\u6cd5\u4f86\u8a3b\u518a\u4e8b\u4ef6\u8655\u7406\u51fd\u6578\u6703\u4ee5\u7269\u4ef6\u7684method\u65b9\u5f0f\u4f86\u8a2d\u5b9a\uff0c\u4e5f\u5c31\u662f\u6240\u8b02\u7684DOM Level 0\u7684\u4e8b\u4ef6\u8655\u7406\u6a5f\u5236\u3002\u4f8b\u5982document.getElementById(“ddd”).onchange=function(){}\uff0c\u90a3\u500bonchange\u672c\u8eab\u5c31\u662f\u4e00\u500b\u51fd\u6578\uff0c\u800cchange\u4e8b\u4ef6\u89f8\u767c\u6642\u5c31\u6703\u53bb\u57f7\u884conchange\uff0c\u90a3\u9ebc\u4e5f\u5c31\u662f\u8aaa\u5982\u679c\u8b93\u9019\u500b\u51fd\u6578\u57f7\u884c\u5c31\u662f\u4ee3\u8868\u89f8\u767cchange\u4e8b\u4ef6\u4e86\uff0c\u800c\u57f7\u884c\u8a72\u51fd\u6578\u5f88\u7c21\u55ae\uff0c\u5c31\u662f\u5728\u51fd\u6578\u540d\u7a31\u5f8c\u65b9\u52a0\u4e0a()\u96d9\u62ec\u865f\u5c31\u53ef\u4ee5\u4e86\u3002\u6240\u4ee5\u7528DOM Level 0\u7684\u65b9\u5f0f\u4f86\u89f8\u767cchange\u4e8b\u4ef6\u5c31\u662f\u50cfobj.onchange()\u9019\u6a23\u3002<\/p>\n

\u4e0d\u904e\u5982\u679c\u662f\u4f7f\u7528addEventListener\u6216attachEvent(DOM Level 2)\u4f86\u8a3b\u518a\u4e8b\u4ef6\u8655\u7406\u6a5f\u5236\uff0c\u4e0a\u8ff0\u4f5c\u6cd5\u5c31\u4e0d\u7ba1\u7528\u4e86\u3002\u67e5\u4e86\u4e00\u4e0b\u624b\u518a\uff0c\u627e\u5230\u300c\u6d3e\u9063\u5408\u6210\u4e8b\u4ef6\u300d\u53ef\u4ee5\u4f7f\u7528\u3002\u5b83\u7684\u4f5c\u6cd5\u662f\u5148\u5229\u7528document.createEvent() [DOM]\u6216document.createEventObject() [IE]\u7522\u751f\u4e8b\u4ef6\u7269\u4ef6\uff0c\u5176\u4e2ddocument.createEvent()\u5fc5\u9808\u518d\u6307\u5b9a\u4e8b\u4ef6\u985e\u578b\u70ba\u53c3\u6578\uff0c\u53c3\u6578\u70ba\u5f8c\u8ff0\u5176\u4e2d\u4e4b\u4e00\uff0c\u5206\u5225\u662f”HTMLEvents”\u3001”MouseEvents”\u53ca”UIEvents”\uff1b\u800c\u4e14\u9084\u9700\u8981\u518d\u7d93\u904eevent.initEvent()\u4f86\u521d\u59cb\u5316\uff0c\u521d\u59cb\u5316\u7684\u53c3\u6578\u6709\u4e09\u500b\uff0c\u5206\u5225\u662f\u4e8b\u4ef6\u985e\u578b\u3001\u53ef\u6ce1\u6cab\u50b3\u905e\u3001\u53ef\u4e8b\u4ef6\u88dc\u6349\uff0c\u4f7f\u7528\u7bc4\u4f8b\uff1ae.initEvent(“change”,true,false)\u3002IE\u7684\u4e8b\u4ef6\u7269\u4ef6\u770b\u8d77\u4f86\u4e0d\u7528\u521d\u59cb\u5316\uff0c\u5be6\u969b\u662f\u5c07\u521d\u59cb\u7684\u52d5\u4f5c\u653e\u5728\u5f8c\u9762\u3002<\/p>\n

\u5b8c\u6210\u524d\u8ff0\u4e8b\u4ef6\u7269\u4ef6\u7684\u5efa\u7acb\u53ca\u521d\u59cb\u5316\u4e4b\u5f8c\uff0c\u63a5\u4e0b\u4f86\u5c31\u662f\u5c07\u4e8b\u4ef6\u6d3e\u7d66\u7269\u4ef6\u3002DOM\u662f\u4f7f\u7528dispatchEvent\uff0c\u4f8b\u5982obj.dispatchEvent(e)\uff0cIE\u5247\u662f\u4f7f\u7528fireEvent\uff0cIE\u5c31\u662f\u5728\u9019\u88e1\u505a\u4e8b\u4ef6\u7269\u4ef6\u7684\u521d\u59cb\u5316\uff0c\u4f8b\u5982obj.fireEvent(“onchange”,e)\u3002<\/p>\n

\u3010\u88dc\u5145\u3011<\/h4>\n

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\u3010\u8a3b\u518a\u4e8b\u4ef6\u3011<\/h5>\n

if(document.addEventListener){<\/p>\n

something to do<\/span><\/p>\n

}else if(document.attachEvent){<\/p>\n

another thing to do<\/span><\/p>\n

}<\/p>\n

\u3010\u6d3e\u9063\u4e8b\u4ef6\u3011<\/h5>\n

if(document.createEvent){<\/p>\n

something to do<\/span><\/p>\n

}else if(document.createEventObject){<\/p>\n

another thing to do<\/span><\/p>\n

}<\/p>\n

\u3010selectedIndex\u3011<\/p>\n

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