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川哥哥Calar

#1 Created at ... [Delete] [Delete and Lock User]

//转换任意类型的对象为number类型 var n1 = Number('123'); //123 var n2 = parseInt('123'); //123 var n3 = parseInt('123'); //123

//转换任意类型为string类型 var s1 = String(123); //'123' var s2 = 123..toString(); //'123' var s3 = (123).toString(); //'123'

typeof可以判断出number/string/function/undefined/boolean的类型，但是无法区分 null/Array/真正对象{....}

判断Array一般使用Array.isArray(arr); 判断null一般使用 myvar==null;

houbo111

#2 Created at ... [Delete] [Delete and Lock User]

最后一个是===

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