javascript using the unary-plus and unary-minus operator 一元操作符
2011-03-05 18:05
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新手入门啊,看看就明白了!
<script src='jquery.js'></script> ...... <script> var a=1; var b='2'; //output number console.log(typeof(-b)); console.log(typeof(+b)); //output string console.log(typeof(b)); //output 12 console.log(a + b); //output 3 console.log(a + Number(b)); console.log(a + +b); console.log(a - -b); //output -1 console.log(a + -b); console.log(a - +b); </script>
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