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想达到这样的效果，解决调用接口数据传来的多空格字符正确渲染在浏览器页面上，进而方便传值的问题（其实一般情况下，渲染值和实际值视觉效果有所不同）

• 例如：把str=“a b c” =>“a  b   c”

• 
  
  用原生方法，通过for循环替换字符串的空格
  

var str="a  b   c"
var strArr=str.split("")//["b","","","b","","","","c"]
for(var i=0;i<strArr.length;i++){
	if(!strArr[i].trim()){
		strArr[i]="&nbsp;"
	}
}
//strArr=>["b","&nbsp;","&nbsp;","b","&nbsp;","&nbsp;","&nbsp;","c"]
str=strArr.join("")//"a&nbsp;&nbsp;b&nbsp;&nbsp;&nbsp;c"

• 
  
  利用正则表达式结合replace替换
  

var str="a  b   c"
str=str.replace(new RegExp(/( )/g)," ")//"a  b   c"
//或者(注意括号里面是有一个空格的)
str=str.replace(/( )/g," ")//"a  b   c"