web前端|js教程
jquery,ie8浏览器
web前端-js教程
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jquery兼容不支持ie8浏览器的解决办法:
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1、IE8不支持jQuery版本解决办法
通过判断IE浏览器的版本来加载对应版本的jQuery
使用语句 可在IE8模式下进行一些兼容操作。代码如下:
<script type="text/javascript" src="/js/jquery-3.1.1.min.js"><script type="text/javascript" src="/js/jquery-1.9.1.min.js">
这样在切换到IE8时,低版本的jQuery就会覆盖高版本的jQuery。如果在IE8下需要调整某些元素的样式的话,最好将JS代码放在页面底部(并注意是否有行内样式),不然为某些动态加载的内容设置的样式可能不会生效。
2、IE8不支持forEach解决办法
为不支持forEach的浏览器添加自定义forEach方法
代码如下:
if (typeof Array.prototype.forEach != function) { Array.prototype.forEach = function (callback) { for (var i = 0; i < this.length; i++) { callback.apply(this, [this[i], i, this]); } };}
如果是引入的jQuery插件,可将该段代码放在插件内容的开头即可,这样在IE8下执行forEach方法就不会报错了。
3、IE8不支持map解决办法
添加自定义forEach方法
if (!Array.prototype.map) { Array.prototype.map = function(callback, thisArg) { var T, A, k; if (this == null) { throw new TypeError(" this is null or not defined"); } // 1. Let O be the result of calling ToObject passing the |this| value as the argument. var O = Object(this); // 2. Let lenValue be the result of calling the Get internal method of O with the argument "length". // 3. Let len be ToUint32(lenValue). var len = O.length >>> 0; // 4. If IsCallable(callback) is false, throw a TypeError exception. // See: /#x9.11 if (typeof callback !== "function") { throw new TypeError(callback + " is not a function"); } // 5. If thisArg was supplied, let T be thisArg; else let T be undefined. if (thisArg) { T = thisArg; } // 6. Let A be a new array created as if by the expression new Array(len) where Array is // the standard built-in constructor with that name and len is the value of len. A = new Array(len); // 7. Let k be 0 k = 0; // 8. Repeat, while k < len while(k < len) { var kValue, mappedValue; // a. Let Pk be ToString(k). // This is implicit for LHS operands of the in operator // b. Let kPresent be the result of calling the HasProperty internal method of O with argument Pk. // This step can be combined with c // c. If kPresent is true, then if (k in O) {// i. Let kValue be the result of calling the Get internal method of O with argument Pk.kValue = O[ k ];// ii. Let mappedValue be the result of calling the Call internal method of callback// with T as the this value and argument list containing kValue, k, and O.mappedValue = callback.call(T, kValue, k, O);// iii. Call the DefineOwnProperty internal method of A with arguments// Pk, Property Descriptor {Value: mappedValue, : true, Enumerable: true, Configurable: true},// and false.// In browsers that support Object.defineProperty, use the following:// Object.defineProperty(A, Pk, { value: mappedValue, writable: true, enumerable: true, configurable: true });// For best browser support, use the following:A[ k ] = mappedValue; } // d. Increase k by 1. k++; } // 9. return A return A; };}