Internet Explorer中的JavaScript数组索引“未定义" [英] JavaScript array index 'undefined' in Internet Explorer
本文介绍了Internet Explorer中的JavaScript数组索引“未定义"的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
以下脚本会为字符串中的每个字符将 undefined 打印到控制台,但在Chrome中可以正常工作.
The following script prints undefined to the console for each character in the string, but works correctly in Chrome.
<script>
function main()
{
var x = "hello world";
for ( var i = 0; i < x.length; ++i ) {
console.log( x[i] );
}
}
main();
</script>
为了使它在所有浏览器中都能正常工作,我是否必须对数组做些事情?
Do I have to do something to the array in order to get this to work properly in all browsers?
推荐答案
某些浏览器(但并非所有浏览器)都支持[]
:
The []
is supported in some browsers but not all:
类似数组的字符访问(上面的第二种方式)不属于 ECMAScript3.这是JavaScript和ECMAScript 5功能.
Array-like character access (the second way above) is not part of ECMAScript 3. It is a JavaScript and ECMAScript 5 feature.
为获得最大兼容性,请使用 String.charAt()
代替:
For maximum compatibility, use String.charAt()
instead:
<script>
function main()
{
var x = "hello world";
for ( var i = 0; i < x.length; ++i ) {
console.log( x.charAt(i) );
}
}
main();
</script>
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