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function CheckDate(text) {
if (!text) return false;
text = text.replace(/[\/-]0?/g, "/");
if (!text.match(/^\d{4}\/\d{1,2}\/\d{1,2}$/)) return true;
var d = new Date(text);
return [d.getFullYear(), d.getMonth() + 1, d.getDate()].join("/") != text;
}
document.open();
var datas = ["", "2010-01-01", "2010/02/30", "2010/02", "2010/22/30", "2012/2/29", "2012/02/29"];
for(var i = 0; i < datas.length; i++) {
document.write(datas[i], "=", CheckDate(datas[i]), "<br/>");
}
document.close();
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=false
2010-01-01=false
2010/02/30=true
2010/02=true
2010/22/30=true
2012/2/29=false
2012/02/29=false
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Identifier Resolution Performance ±êʶ·ûʶ±ðÐÔÄÜ
Identifier resolution isn't free, as in fact no computer operation really is without some sort of performance overhead. The deeper into the execution context's scope chain an identifier exists, the slower it is to access for ......
µÚÈýÕ DOM Scripting DOM±à³Ì
DOM scripting is expensive, and it's a common performance bottleneck in rich web applications. This chapter discusses the areas of DOM scripting that can have a negative effect on an application's responsiveness and gives recommendations o ......
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