How to fix Array indexOf() in JavaScript for Internet Explorer browsers
If you have worked with JavaScript at any length you are aware that Internet Explorer does not implement the ECMAScript function for Array.prototype.indexOf() [including Internet Explorer 8]. It is not a huge problem, because you can extend the functionality on your page with the following code.
Array.prototype.indexOf = function(obj, start) {
for (var i = (start || 0), j = this.length; i < j; i++) {
if (this[i] === obj) { return i; }
}
return -1;
}
When should I implement this?
Should I wrap it on all my pages with the following check, which checks if the prototype function exists and if not, go ahead and extend the Array prototype?
if (!Array.prototype.indexOf) {
// Implement function here
}
Or do browser check and if it is Internet Explorer then just implement it?
//Pseudo-code
if (browser == IE Style Browser) {
// Implement function here
}
Do it like this...
if (!Array.prototype.indexOf) {
}
As recommended compatibility by MDC.
In general, browser detection code is a big no-no.
或者，您可以使用jQuery 1.2 inArray函数，它应该可以跨浏览器使用：
jQuery.inArray( value, array [, fromIndex ] )
The full code then would be this:
if (!Array.prototype.indexOf) {
Array.prototype.indexOf = function(obj, start) {
for (var i = (start || 0), j = this.length; i < j; i++) {
if (this[i] === obj) { return i; }
}
return -1;
}
}
For a really thorough answer and code to this as well as other array functions check out Stack Overflow question Fixing JavaScript Array functions in Internet Explorer (indexOf, forEach, etc.).
链接地址: http://www.djcxy.com/p/18950.html上一篇: .indexOf（）在IE8中不起作用