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Also use variable type forced conversion in JavaScript

高洛峰

Release： 2016-11-28 13:10:35

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<script language="javascript">    var str = &#39;100&#39;;
    var num = Number(100);
    alert(typeof(num) + &#39;: &#39; + num);
    var obj = Object(str);
    alert(typeof(obj) + &#39;: &#39; + obj);
    var bool = Boolean(str);
    alert(typeof(bool) + &#39;: &#39; + bool);
 
    var num = 100;
    var str = String(num);
    alert(typeof(str) + &#39;: &#39; + str);
    var bool = Boolean(num);
    alert(typeof(bool) + &#39;: &#39; + bool);
    var obj = Object(num);
    alert(typeof(obj) + &#39;: &#39; + obj);
 
    var bool = true;
    var str = String(bool);
    alert(typeof(str) + &#39;: &#39; + str);
    var num = Number(bool);
    alert(typeof(num) + &#39;: &#39; + num);
    var obj = Object(bool);
    alert(typeof(obj) + &#39;: &#39; + obj);
 
    var obj = {};
    var str = String(obj);
    alert(typeof(str) + &#39;: &#39; + str);
    var num = Number(obj);
    alert(typeof(num) + &#39;: &#39; + num);
    var bool = Boolean(obj);
    alert(typeof(bool) + &#39;: &#39; + bool);
    </script>

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