为什么不能按变量名打印内容？

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为什么不能按变量名打印内容？

asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

为什么不能按变量名打印内容？

请教为什么无法通过变量名获取打印的变量内容呢?

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<body>
<script>
window.onload=function(){
    var sColor="#114578";
    var  col0 = sColor.substring(1, 3);
    var  col1 = sColor.substring(2, 5);
    var  col2 = sColor.substring(4);
 var btn = document.getElementsByTagName("button");
 var btnL = btn.length;     
for( var i=0; i<btnL; i++){
    (function (e) {
        btn[e].onclick = function(){ 
            var subStr=col[e];
            alert(subStr);
            }
        })(i);
}
  }
</script>
<button>按钮1</button>
<button>按钮2</button>
<button>按钮3</button>
</body>
</html>

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1 Answer

深蓝 · Answer 1 · 2021-02-06T00:27:32+0000

请把下面这段代码：

    var  col0 = sColor.substring(1, 3);
    var  col1 = sColor.substring(2, 5);
    var  col2 = sColor.substring(4);

修改为：

var col = [];
col.push(sColor.substring(1, 3));
col.push(sColor.substring(2, 5));
col.push(sColor.substring(4));

@姜立 eval()能不用就不用吧

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为什么不能按变量名打印内容？

为什么不能按变量名打印内容？

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