show sourceview sourceprint?存在运算符 "+" ,意味着将[10]转化为一个值,相当于调用其valueOf()方法,而Array的valueOf相当于其toString |
var result =[ 'a' , 'b' , 'c' ] + "" ; |
show sourceview sourceprint?与一个空字符相加,我们大可以就当成强行调用其toString方法,而Array的toString方法相当于调用其join方法,join的默认分隔符则为 "," |
show sourceview sourceprint?show sourceview sourceprint?show sourceview sourceprint?'a' 首先要转换为一个Number类型,既然不能转换为一个正常的数字,就转换为NaN,与NaN进行运算结果都为NaN |
var result =obj[ "10" ] +obj[10] +obj[[1,0]]; |
show sourceview sourceprint?对象的键总为字符串,因此obj[10]相当于obj[ "10" ],obj[[1,0]]相当于obj[ "1,0" ] |
show sourceview sourceprint?!!$[([])]() -->!!$[ "" ]() -->!!String() -->!! "" --> false |
var result =( ' \t\r\n ' == 0); |
show sourceview sourceprint?参见http: //www.cnblogs.com/rubylouvre/archive/2009/09/18/1568794.html这里的回复讨论 |
var a = new String( "123" ); |
show sourceview sourceprint?show sourceview sourceprint?http://blog.vjeux.com/2009/javascript/smallhash-information-compression.html if ($ != jQuery) {
$ = jQuery.noConflict();
}
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