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是6吧？

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wwz_hello

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

得到的结果是6不是7啊;

var s='hello, world';
var a = s.indexOf(' world')
alert(a);

wwz_hello

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

有空格' world'是6，没空格是7

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