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博客园 - jeky

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全等(===)
jeky · 2009-04-20 · via 博客园 - jeky

第一次发现全等(===)这个比较运算符:

===     全等(值和类型)

    

<script type="text/javascript">
var x = 5;
document.writeln(x 
== 5);    // true
document.writeln(x == '5');    // true
document.writeln(x === 5);    // true
document.writeln(x === '5');    // false
document.writeln(x != '5'); // false
document.writeln(x !== '5');    // true
</script>