js 实现　pring_r功能

// JavaScript Document
var SYS=function(){}
SYS._print_r=function($v,$left,$ret){
	    if(typeof $left ===‘undefined‘){
			$left = -1;
		}
		 if(typeof $ret ===‘undefined‘){
			$ret = "My";
		}
		$left+=1;
		if (typeof $v ===‘object‘ ){
			return SYS.arrayToString($v,$left,$ret);
		}
		return   $ret+$v+"\n";
	}

	SYS.arrayToString=function($v,$left,$ret){
			$ret+="Array\n"+str_repeat(‘  ‘,$left*4)+"(\n";
			for ($key in $v)
			{
				$parmret=$ret+str_repeat(‘  ‘,$left*4+2)+"["+$key+"] => ";
				$ret=SYS.recursionPrintR($v[$key],$left,$parmret)	;
			}
			 $ret+=str_repeat(‘  ‘,$left*4)+")\n\n";
		 return $ret;
	}

//递归调用_print_r
	SYS.recursionPrintR=function($val,$left,$ret){
		if (typeof $val ===‘object‘){
			return SYS._print_r($val,$left,$ret);
		}
			return $ret+‘<div style="border:1px #eee solid; width:auto;padding:5px;‘

			+‘ left:‘+($left*50+100)+‘px;position:relative; height:20px; overflow-y:hidden; " ‘
			+‘ onClick=" ‘
			+‘ "   ><span onClick="window.SYS.ch.apply(this.parentNode,[1])">[+]</span><span onClick="window.SYS.ch.apply(this.parentNode,[-1])">[-]</span>‘+$val+‘</div>\n‘;
	}
	SYS.print_r=function($v,$left,$ret){
		 if(typeof $left ===‘undefined‘){
			$left = -1;
		}
		 if(typeof $ret ===‘undefined‘){
			$ret = "My";
		}
	    return ‘<pre>‘+SYS._print_r($v,$left,$ret)+‘</pre>‘;
	}
SYS.ch=function(sign){
	var h=this.style.height;
	h=(h.replace(/px/, ‘‘)) ;
	this.style.height=(parseInt(h)+sign*100)+‘px‘
	} 

function str_repeat($str,$num,$cn){
	if(typeof $cn ==="undefined"){
	    $cn = 0 ;
	}
    $cn=$cn+1;
    if($num==0){return "";}
    else
    {$temp=$str;}
    return $num>$cn ? $temp+str_repeat($str,$num,$cn) : $temp;
}

　　注意：这里的不是数组是object.如果要输出数组请把判断类型改为　array

调用：这里的THREE指的是　three.js中的对象

SYS.print_r(THREE)