js脚本里面with用法 顺序赋值
首先,给出个人的理解:with就是为了封装某个对象,减少某个对象的调用比如:定义一个对象
var a={},a.name='张三';a.易做图='女';
一般的调用方式
console.log(a.name);
console.log(a.易做图);
使用with之后的调用
with(a){
console.log(name);
console.log(易做图);
}
以下给出示例代码
<div id='div1'>test</div>
<script>
var a = {};
a.aa = 1;
a.bb = 2;
a.cc = 3;
with(a) {
console.log(aa);
console.log(bb);
console.log(cc);
}
var b = function() {
this.a = 111;
this.b = 222;
}
b.prototype.test = function(param) {
this.a = param;
console.log(this.a)
};
with(new b()) {
test('just for test');
}
var div1 = document.getElementById('div1');
with(div1.style) {
width = '200px';
height = '300px';
background = 'red';
color = 'white';
}
</script>