How to disable zooming in javascript
javascript实现禁止缩放的方法：1、设置对应浏览器的启动参数来禁止用户缩放页面；2、设置meta来禁止用户缩放页面；3、通过js监听来禁止用户缩放页面；4、禁用“ontouchmove”事件；5、通过多点触摸手势库实现。
本文操作环境：windows7系统、javascript1.8.5版、Dell G3电脑。
javascript怎么实现禁止缩放？
javascript浏览器禁止用户放大缩小的五种方法
方案一：设置对应浏览器的启动参数来禁止用户缩放页面
这种方案在自建平台上，自选的指定浏览器上效果是可以的，但是不推荐，比如chrome主要通过设置* { touch-acion : none }来实现禁用缩放的方法，具体方案可自行搜索,我也没有进行相关测试。
touch-acion的参数意义如下：
auto：默认值。浏览器允许一些手势（touch）操作在设置了此属性的元素上，例如：对视口（viewport）平移、缩放等操作。
none：禁止触发默认的手势操作。
pan-x：可以在父级元素(the nearest ancestor)内进行水平移动的手势操作。
pan-y：可以在父级元素内进行垂直移动的手势操作。
manipulation：允许手势水平/垂直平移或持续的缩放。任何auto属性支持的额外操作都不支持。
注：touch-action只支持具有CSS width和height属性的元素。这个限制的目的是帮助浏览器优化低延时的手势操作。对于默认不支持此属性的元素，如这种内联元素，可以给它设置display:block这样的CSS属性来支持width和height。未来W3C规范会将此API扩展到支持所有元素。
方案二：设置meta来禁止用户缩放页面
这是搜索后经常出现的方案，但是现在，这个标签在新的浏览器（比如在ios10+）中已经失效，换言之，对于老版本的浏览器可能有效。
在Android的自带浏览器中(例如华为，魅族，小米)第一次手动缩放时，会提示–再次操作可强制缩放网页—；再次缩放也可以缩放；
这一现象意味着meta标签的失效。在Android的chrome中不可以用户缩放（表现正常）
直接上代码（在.html文件中的
之间添加如下语句）：<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no;" name="viewport" />
方案三：通过js监听来禁止用户缩放页面
直接上代码：
window.onload=function(){
document.addEventListener('touchstart',function (event) {
if(event.touches.length>=2){
event.preventDefault();
}
})
document.addEventListener('touchmove',function (event) {
if(event.touches.length>=2){
event.preventDefault();
}
})
document.addEventListener('touchend',function (event) {
if(event.touches.length>=2){
event.preventDefault();
}
})
}其中的event.touches.length是获取当天有几个点击事件同时发生，简单而言，就是有几个手指同时点击了屏幕，以为一般缩放操作都是两个手指以上进行的，所以这里应该满足的条件为event.touches.length>=2。不足之处就是禁用了所有的多点触控的操作。
【推荐：javascript高级教程】
方案四：禁用“ontouchmove”事件
因为缩放屏幕必然跟随着双指的ontouchmove事件，我们在标签内加入禁用该事件的函数event.preventDefault()即可，这招非常暴力，意味着全局无法使用使用滑动、拖动等动作，只接受点击动作。
代码如下——
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" ontouchmove="event.preventDefault();">
<head>
/****some code***/
</head>
<body>
/****some code***/
</body>
</html>其中的event.preventDefault()函数将通知 Web 浏览器不要执行与事件关联的默认动作（如果存在这样的动作）。例如，如果 type 属性是 “submit”，在事件传播的任意阶段可以调用任意的事件句柄，通过调用该方法，可以阻止提交表单。注意，如果 Event 对象的 cancelable 属性是 fasle，那么就没有默认动作，或者不能阻止默认动作。无论哪种情况，调用该方法都没有作用。
写到这里，忽然想到，是否只禁用某个
区块的ontouchmove事件，比如：<div ontouchmove="event.preventDefault();"></div>
但这种区块禁用的方式我还没有测试，你可以说我比较懒了，自己去测试吧～～～～
然而还没有得瑟一个月，我就有了这个需求，补充如下，直接上实现代码：
var singleTouchFlag; //多指触控标识符
$("#songList").on("touchstart", function (e) { //引用了jquery库，我所要多指禁止的区域id为“songList”
// 判断默认行为是否可以被禁用
console.log("touchstart Entered!!!");
if (e.cancelable) {
// 判断默认行为是否已经被禁用
if (!e.defaultPrevented) {
e.preventDefault();
}
}
if (1 == parseInt(e.originalEvent.touches.length)) {
singleTouchFlag = true;
// do something
} else {
singleTouchFlag = false;
}
});
$("#songList").on("touchmove", function (e) {
// 判断默认行为是否可以被禁用
if (e.cancelable) {
// 判断默认行为是否已经被禁用
if (!e.defaultPrevented) {
e.preventDefault();
}
}
if (singleTouchFlag) {
//do something
}
});
$("#songList").on("touchend", function (e) {
// 判断默认行为是否可以被禁用
console.log("touchend Entered!!!");
if (e.cancelable) {
// 判断默认行为是否已经被禁用
if (!e.defaultPrevented) {
e.preventDefault();
}
}
if (singleTouchFlag) {
//do something
}
});方案五：借助于**多点触摸手势库“hammer.js ”**解决
hammer.js 是一个多点触摸手势库，能够为网页加入Tap、Double Tap、Swipe、Hold、Pinch、Drag等多点触摸事件，免去自己监听底层touchstart、touchmove、touchend事件并且写一大堆判断逻辑的痛苦。
hammer.js 不但支持触摸屏设备的浏览器，在桌面浏览器上，也能将鼠标的点击当做触摸，方便开发人员在桌面浏览器上调试。（JS仔在自己的随手背项目里面也用了hammer.js，真心好用）
直接上代码（在.html文件中的
之间添加如下语句）：<script src = "http://eightmedia.github.com/hammer.js/hammer.js" > </script>
<script>
window.onload = function () {
var hammerMusicBlock = new Hammer(document.getElementById("musicBlock"));
hammerMusicBlock.ontransformstart = function (ev) { ev.preventDefault(); }; // double fingers touchstart
hammerMusicBlock.ontransform = function (ev) { ev.preventDefault(); }; // double fingers touchmove
hammerMusicBlock.ontransformend = function (ev) { ev.preventDefault(); }; // double fingers touchend
}
</script>hammer.js 其他的使用方式简介，直接看代码：
<script src = "http://eightmedia.github.com/hammer.js/hammer.js" > </script>
// 先要对监听的DOM进行一些初始化
var hammer = new Hammer ( document . getElementById ( "container" ) ) ;
// 然后加入相应的回调函数即可
hammer . ondragstart = function ( ev ) { } ; // 开始拖动
hammer . ondrag = function ( ev ) { } ; // 拖动中
hammer . ondragend = function ( ev ) { } ; // 拖动结束
hammer . onswipe = function ( ev ) { } ; // 滑动
hammer . ontap = function ( ev ) { } ; // 单击
hammer . ondoubletap = function ( ev ) { } ; //双击
hammer . onhold = function ( ev ) { } ; // 长按
hammer . ontransformstart = function ( ev ) { } ; // 双指收张开始
hammer . ontransform = function ( ev ) { } ; // 双指收张中
hammer . ontransformend = function ( ev ) { } ; // 双指收张结束
hammer . onrelease = function ( ev ) { } ; // 手指离开屏幕
hammer.js 还支持jQuery插件的形式调用：
<script src = "http://eightmedia.github.com/hammer.js/jquery.hammer.js" > </script>
$ ( "#element" )
. hammer ( {
// 对DOM进行一些初始化，这里可以加入一些参数
} )
. bind ( "tap" , function ( ev ) {
console . log ( ev ) ;
} ) ;暂时总结这五种方案，如果有其他更好的方案，请添加到评论区，谢谢。
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