jQuery.validator.addMethod("check_user", function(value, element) {
var check = /^[A-Za-z\s]+$/;
//this.optional(element)如果元素为空并且不需要，则立即返回true。
return this.optional(element) || (check.test(value));
}, '...
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jQuery.validator.addMethod("check_user", function(value, element) {
var check = /^[A-Za-z\s]+$/;
//this.optional(element)如果元素...